The best cleaner I've use on black streaks.

When I bought Bio-Kleen, I bought it because of the reviews I read. For once, They were right on. We have a 29' Travel trailer 13 years old, Had some bad black streeks. Started to order just a quart spray bootle. Then seen how much cheaper it was by the gallon. I also figured on small bottle would just get us started and hoped one gallon would be enough. Glad I bought the gallon because we only used about a quart doing our camper, made it look almost new. I then found it worked great on my bass boat too. It is a little work but found a cloth wet with this full strength was all you needed. Tried brush and it worked but no better than a cloth. My wife and I did our whole camper in 1/2 day. Excellent product.

I have owned RV trailers for almost 30 years. About 2 years ago we bought a 2017 park model in great shape but it had lots a grey and black streaks. Tried lots of other products but nothing worked then tried Bio Kleen Black Streak remover. I have never endorsed a product before but this product is absolutely amazing. In about an hour I cleaned the whole trailer and it looks brand new. I highly reccommend this to anyone that owns a RV trailer. It will save you time and money.

Like the others say, tried many with soar arms to show for it. This stuff takes it off, sprayed it on wiped it around and followed up with another rag. Still took some elbow grease but mine has a couple years worth of build up. When I was done I had a white camper again. This was a GREAT find !!!!!!!!!!!!!

This product is absolutely Amazing how easy it removes the black streaks from my RV, I would recommend this product to any RV owner.