Biokleen M00509 Black Streak Remover - 1 Gallon.

This stuff works great! But there are a few things to know before you buy this.Number one, it is Extremely strong... That means you wear gloves. I didn't but I never wear gloves no matter what chemicals I'm working with, I. Don't really care because my hands are so tough, nothing bothers them.... This stuff turned my alligator bulletproof skin into baby skin In one panel. Which is great because the wife is always complaining About the the escalator and elevator grease I get under my fingers and in the dry cracks From work, this cleaned it all out.Number two, this is not good to use on very, very old thin trailer paint. My trailer is 7 years old and has never been washed. The paint is aged and has years of acid rain chewing into it. Many years or minerals and deposits from rain and trees that has been building on it. I could see where this was starting to eat through the paint so I worked in very small areas and worked very fast.If you're careful even with thin old worn paint, it will still do its job without damaging. You just have to be within seconds of being correct on when to scrub, apply and rinse... Very, very small margin of error so if you're not really good, don't do it..If you let it get on aluminum like fenders, it will etch into them. And then you will be polishing them later. This stuff and aluminum don't go well together.But all in all this stuff is strong. And that's what I wanted. So it is perfect for what I need. And you can see by my pictures it does a pretty good job.Use it full strength and work fast and small areas.. I don't care how tough your skin is wear gloves!If you're a mechanic, do one panel without gloves, it will make your skin look great and soft and your wife will love it No more complaining on how grungy your, your hands look anymore.

Does remove black streaks well on camper but prepare to use some elbow grease. Definitely use gloves, will be rough on skin if comes into contact

I don’t do many reviews but I do them when I run across a great product. This is one of those. I have used several name brand products that do very little to get rid of black streaks. Wasted a lot of money. This stuff took the black streaks off without having to scrub! Amazingly easy! Now I will get the travel trailer clean and will wax the entire camper. I have learned that the black streaks will wash off with a regular wash IF you have a good wax coating at least once a year. The section I had waxed last year was easy to get rid of the black streaks with a regular wash.

Pour on rag , wipes of 10 years of streaks with little effort.

Hurt my and didn’t wash my trailer from October to July. Black streaks were covering the RV. Sprayed the product on and after 5secs it cleaned black streaks completely off. Tried lots of products, this one will be my go to.