This stuff works! I was not expecting how easily the black streaks disappeared. It is as easy as wiping on and wiping off. A little goes a long way too. Fabulous product!

I have been researching on line for a product to use to get rid of black streaks on my 7 years old aluminum trailer. I went to an RV store and asked what they recommended. They said they had been selling a lot of the Bio-Kleen product. It was a little high priced but since it has a 30 day money back guarantee I decided to try it. I didn't know my trailer had turned grey! Bio-Kleen worked so well, my trailer looks like new!!

I used this on my pontoon boat - on the painted sides of the many body. They had what I would call a general 'greying' and what is considered black streaks. I have tied many things on this boat in past 2 years - nothing got rid of it. Even heavy duty stuff and lots of elbow grease. Never made a dent. I bought this stuff based on a recommendation from some boat forum. A spray or two of this and a light wipe with a microfiber towel and it came right off. I still do not believe it to be honest. Never has a product worked as well for one purpose as this. Wow is all I can say.

I've tried so many different brands of black streak removers for our travel trailer. All of them produced mediocre results at best. After researching and finding great reviews on Bio-Kleen black streak remover, I decided to spend the extra money and give it a shot. WAS I SURPRISED! The product quickly and easily removed all the black streaks. Never again will I waste my time and money on other products! Bio-Kleen is worth it's weight in gold. I also used the product on the white gutters on my home which have a ton of black streaks on them. I was going to replace the gutters because they looked so bad, but I simply applied the Black Streak remover and the gutters look good as new again. Quite wasting your time and money and buy this product!

<p>This product actually works. I've tried many "brand" name products in the past but this did exactly what was expected and specified on a RV with metal siding. Works well on an old fiberglass boat also. Buying by the case is cost effective.

Looking forward to trying other products from this company.

Follow the directions and it will work.</p>