Harbor Safe Marine Care Products
Waxes, Cleaners & Polishes

57 Reviews
93% (53)
5% (3)
0% (0)
0% (0)
2% (1)
98% Recommend this product (56 of 57 responses)
By Joe
Hayward, WI
Great Product!
May 4, 2021
Gets all the mildew stains off everything and cleans up other stains too.
By Sharon B.
Lake Oconee GA
Awesome Product
April 23, 2021
Searched for years for a boat cleaner that would clean mildew up for of our boat. This product did it!!!!
By SeaRascal
Sea Bright, NJ
This product really does work as advertised!!!
April 7, 2021
I have had small mildew spots on my bench seat on my flybridge for many years, which I have tried everything to remove. Nothing has truly worked until I tried Marine31 Mildew Stain Remover. Within minutes, the mildew was breaking up and easily wiped away with a terry cloth towel. Certain areas needed to be treated twice.
ProsEasy to use and it works!
ConsIt smells like it contains bleach, which it obviously does. It took the color out of my sweatshirt and pants while using the product. Be careful using it.
By Deb
Great product!
March 11, 2021
My husband and I are meticulously clean when caring for our boat. After a winter of storage when it gets some mildew on the upholstery, this product eliminates it completely.
By Robalo J.
March 9, 2021
This is the BEST mildew remove product I have ever used!!!!! I have been boating for over 40 years and NEVER found a product that works this well. It is so easy to use no scrubbing at all.I live in Fla, where mold is problem Marine 31 is the solution!!!!!
ConsI cannot find marine 31 at any local merchants. Buying it on line is the only way I could purchases it.
By Sue
Cudjoe Key Florida
Mold on pontoon seats
December 6, 2020
We had mold all over our pontoon seats that other products didn’t touch. Marine 31 removed most of the mold within 5 minutes. My husband found brushing it on with a paint brush had more control of the product so it wouldn’t spray on the seams. We really are happy with the results and have shared it with our friends.
By Ed
New York
Marine 31 Mildew Remover
October 30, 2020
I have tried several other products over the years with limited success. The ones that worked still required repeated applications and a lot of scrubbing. I could literally see the mildew stains disappear moments after I sprayed the area.
By Jim
It worked great
September 20, 2020
I used Marine on my 1991Mustang GT convertible top and it is a brilliant white again. I should have taken a before and after picture, the difference was amazing. Just prayed it on and rinsed it off. It was done in a short time. I would highly recommend Marine 31.
ProsWorks as advertised
By Joel
Amazing Product
August 1, 2020
I wish I took a before and after picture...my white boat seats were loaded with mildew....used Marine 31 and let it sit. Didn't even have to scrub...this stuff works all by itself. I gonna buy more for my other boat and golf club seats.
By Anne K.
Bel Air, MD
Return customer
July 14, 2020
We've tried everything to get rid of the mildew on our vinyl pool lounge chairs. I found this online and read all about the great ratings so I decided why not give it a try. It truly is amazing! It completely removed all the mildew and kept is away! We have 8 lounge chairs and the smaller bottle cleaned 6. Reordered more but bought the 32 oz to last through the summer. Great product and does exactly what it says. Again, I've tried EVERYTHING for the past 3 years and I will no longer waste my time on alternatives. Marine 31 will be all I use each season!
trinity, alabama
July 6, 2020
This product does what it says it will do. I will purchase again
By Mike S.
Brandon Fl
Better than expected
June 24, 2020
I bought a bottle with doing some research and hoping for the best. I was so happy that the product worked as advertised and turned my seats from basically nasty to DAMN CLEAN. I. impressed.
By Cathy I.
Mobile, Alabama
Loved this product
June 4, 2020
It worked beautifully without fuss... boat seats look brand new. Had doubts they would clean up but this did the trick.
ConsShipping cost & It took to long to arrive... I am Amazon spoiled 😜
By Charlotte
June 3, 2020
Our older pontoon looks like new.
Indianapolis, Indiana
It works!
June 2, 2020
We thought we had our boat seats pretty clean until using Marine 31 - they're now next level clean. Great stuff so far!
By David B.
Nokomis, Fla
May 26, 2020
Marine 31 is the best product EVER for removing mildew and ALL stains from marine vinyl. Easy to use even; literally spray on, let it work (some spots take longer than others), and wipe it off. I used it in the entire cockpit of my 2001 boat, and it doesn’t look like a used boat at all!! Love this product!!
By John
May 20, 2020
Unbelievable product cleaned all seats like new in 50 minutes on my 24ft pontoon!
By Ted
Cicero In.
Great cleaner
May 14, 2020
Marine 31 mildew cleaner works best. Little bit goes long way. Cuts the time .
By LuAnn
Balaton, MN
A great product.
May 5, 2020
It was absolutely amazing how well this cleaned our pontoon seats. They almost looked new.
By Sue
New Hampshire
It works!!
April 21, 2020
I’ve tried everything to get rid of those gray mold stains on the boat. This is the only thing that worked!
By Greg
Chesapeake City, MD
Good, but not as great as I had hoped.
April 7, 2020
I was hoping to eliminate the black dots and yellow/orange stains on our pontoon seats. While this product definitely made the seats cleaner, it really did nothing for those issues. We wound up having to use a wipe on paint product to cover the stains.
Pros- Partially cleaned seats - Fair price
Cons- Didn't eliminate spots - Didn't eliminate certain stains
By George
Simply the best
February 21, 2020
Unlike other mildew products, this one really works.
ProsCleans real problem areas if you follow directions.
ConsMust use gloves! Protect your hands.
By Dennis
This one works!!
February 20, 2020
I have tried them all. This is the ONLY product that works.
By Pat
Naples, Florida
Saved us thousands in replacement costs!
January 30, 2020
We have outdoor furniture made by Ethos. They are outdoor wicker and cream colored “marine leather”. After 5 years of being in the lanai they were starting to mildew even though we cleaned as suggested by the manufacturer. Heartbroken we had almost decided to replace them when I did a little searching on the internet. I purchased this product with the mindset of having to replace anyway, so no harm. I literally sprayed and walked off to get a cloth. By the time I came back, less than 2 minutes, most of the mildew was running down the sides. I simply wiped it off!!!! There were 2 areas on 2 chairs that needed extra applications but EVERY SINGLE PIECE LOOKS BRAND NEW! I am heartbroken I didn’t think to take a before photo. You have a devoted fan and forever customer! (I purchased all the other products that go with this too!)
ProsEffective!!!! It really works!
ConsCan be a little harsh smelling, so use in a well ventilated area.
By Ron
New Port Richey, FL
works great
January 2, 2020
best product on the market for mildew removal
Conslittle pricey
By Rob K.
Naples, FL
worked like a champ
November 3, 2019
It was like night and day. I was very skeptical after seeing a video of how fast and well it worked. Tested it out on one section after i took the covers off the boat. Was so easy, i didn't have to agitate the area at all. Would highly recommend this for anyone who has those mildew spots. Going to buy the mildew guard. Looking at other products they have.
By Duane
Girard, Ga
Best yet!
October 25, 2019
I have tried all sorts of cleaners to remove mildew from my boat seats. Marine 31 is by far the best I have ever used!!
By Ken
Okeechobee, Fl
October 13, 2019
Works great with very little effort!! Best ever used!
By Rosemary
Utica, New York
Amazing Product! I am a believer!
October 13, 2019
I remained skeptical even after watching many You Tube videos . But I am a believer now! I have a 1996 pontoon boat with seats that are in great condition but were covered with the unsightly black mildew stains. After just 1 application of Marine 31 Mildew remover the mildew was gone!
By Boston B.
Dana Point
Awesome Product!!!!!
October 11, 2019
I just used Marine 31 on my Boston Whaler backseat cushions that had spots that I could not get rid of. They were small dark spots and I figured I would have to live with them until I used Marine 31. I wish I took a before picture but I was too excited to try this stuff out and I don’t think I was a true believer until now. Thank You!!!!
By Greg
Louisville, Ky
Best Product i have found!
September 29, 2019
I have used multiple mold removing cleaners on my boat and nothing comes close to this one! My seats have not looked this good in years! Thanks
By Gary
Boca Raton
This stuff is amazing
September 21, 2019
It works as described
By alex k.
ON, canada
Thank you
August 29, 2019
It is a masing how it remove mildew, dirt and stain of my boat seats and interior panels. I would recommend to everybody ho has to deal with mildew issues. Thank you Alex
August 14, 2019
Effortlessly removes stain in marine vinyl. We were going to replace the steering wheel on the boat because it was so deeply mottled with dark stains that we thought would never come out, but it came out new looking with this stuff! Actually after a year of sitting out in the weather, almost every surface had mildew/mold stain, now the entire boat looks new!
ProsIt took longer to read the directions than it did to remove a stain!
ConsMake sure you read the warnings on the label. Use in well ventilated area.
By Ramon
Lake Anna
Wow this stuff works great!
August 8, 2019
It's like magic. Best decision to buy this
By Richard
Works Great
August 5, 2019
self cleaning right out of the bottle amazing,
ProsSpray and your done no scrubbing no extra work.
By Jean O.
Emily Minnesota
August 1, 2019
If I knew that the mildew was LITERALLY going to vanish before my eyes I would have videotaped it! I am thrilled to have found a product that really worked! To be able to remove mildew from a 36-year-old pontoon is amazing! I will buy again; it's worth every penny!
By Steven S.
July 25, 2019
I have used many other products and didn’t have too much confidence I could get my vinyl clean. Marine 31 changed that! It works wonders and had my 16 year old vinyl looking new. Great product.
By Amy
July 8, 2019
Your mildew remover works like magic. It even removed an old mildew stain that was on our seat for years. Awsome product. Worth every dollar.
By Keith
Long Island NY
Removed tough mildew spots in 1 treatment.
June 23, 2019
This is some really strong stuff, I tried 4 other products that lightened the mildew marks I had but this stuff got rid of them all together. I couldn’t be happier.
By Mark
Great product
June 21, 2019
Cleaned my boat upholstery and outdoor furniture better than anything else I used
ProsEasy to use
ConsChlorine smell
By Gwen
In a word, magic.
June 12, 2019
It took me many tries to get only half as good as Marine 31 in one application.
June 7, 2019
By Gary
Great Product
June 5, 2019
easy to use, works great!
By Jeremy A.
This really works
May 31, 2019
I have finally found a mildew remover that works as should this stuff is awesome I highly recommend it
By Rusty
Lake Ozark, MO
May 31, 2019
Works as promised.
By Gorgie
Central, Illinois
The best I’ve ever used
May 26, 2019
After trying several products this mold remover did the job. I would highly recommend.
By JoJo
Dundalk, Maryland
May 26, 2019
This product does exactly what it claims to do. I have white cushions, and they look show room quality. I receive allot of compliment.
By Mike H.
Central Arkansas
Great purchase
May 9, 2019
Did exactly what it was supposed to. I was liery at first bc I hadn’t heard of this brand and was nervous about hurting/staining the seats, etc. however after using the product and seeing the results, I have already made another purchase and it is now a common name and I will spread the word
ProsDoes exactly what it is supposed to do
ConsFollow the directions, that?s what they?re there for. **Leave on the recommenced time, if not you will see marks/stains
By Kay G.
Sebastian Florida
Removed the mold
April 29, 2019
It didn't take away the old Orange spots but, it did take away all the gray and black mold best product I've found yet to take care of the boat cushions and seats. Would recommend. I've tried a lot of products for boat cushions and this is by far the best.

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