BiokleenProducts, Inc. Products, M00609 Fiberglass Cleaner Gallon

Works as direction say

Seems to depend what type of surface you put it on.On our fiberglass boat which sits in the water all summer, it helped to apply to dry hull and let sit for a few minutes, agitate and re-apply. I found at least a couple of applications were necessary. Another product I used last year was more expensive but tended to eat away the scum faster and easier.Having said that, when applied to my aluminum boat hull it worked extremely well. I would guess the scum on that hull had been there for at least a couple of years, and within less than a minute you could almost wipe the grime off. Didn't seem to hurt the white paint on other parts of this hull when I applied there.Only giving 3 stars as I bought this mainly for our fiberglass hull and other products work better, but it does work, just requires more work and also used about 1/2-2/3's of the bottle for 18 foot boat.I will use the rest to clean the rest of the aluminum boat and try it on our RV/trailer next year.

It does not clean older fibreglass boats save your money

I have not been able to clean a fiberglass tub surround as clean as I would like it to be. And of course I have tried numerous products that were advertised to work. None of them worked. This stuff really works!!! I am impressed. Spray it on, wait 5 minutes, wipe off, rinse. As with all cleaning products, I wear gloves, an N95 mask, and eye protection. I am beyond happy to have finally found a product that works!!!

Wow, I couldn't believe how the layers of mineral deposits, grime, mold, and oxidation that built up since the middle 1980s disappeared and the fiberglass now has the original luster that was lost over all the years. We unsuccessfully tried mineral deposit cleaners, bleach, etc., and what they did was superficial.You may have to apply this product more than once to get ancient stains up, but it is worth it. Wow!!!!!!!!!!!