Biokleen M00509 Black Streak Remover - 1 Gallon., 128 Fl Oz (Pack of 1)

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.

First of all we've owned an weekend warrior 5th wheel toybox trailer for 23 years. Yes it has its blemishes but I've kept it CLEAN. It sits outside all year in storage yard. A good power washing usually does the trick but the silicone & lap sealer is now dark & deposits black streaks at bottom of windows & rain gutter lip. I also have discoloration at the awning arms. That being said I've used MANY self proclaimed black streak sprays & cleaners all have disappointed. This cleaner works great & surpassed my expectations. Im pretty meticulous & i dont write reviews on most products. This can be placed in a spray bottle at full strength & wiped on to remove discolorations. Use as directed & wash off with water. It cleans off road grime & diesel exhaust really well. I did not have any issues with the old paint & oxidation. It cleaned spots off of plastic storage doors, entry doors hatches, gas doors & Black Wheelscuffs off interior walls. Use an old towel w texture for rubbing & removing streaks. I highly recommend!

Great product for metal sided trailers. Never found anything that takes away those nasty black streaks we would get on our couchman catilina,till we tried this product. " Love it", works like magic. Wish we could find this same magic for a fiberglass laminated RV!

gets rid of black marks very easily

Didn’t work for me on my travel trailer. It helps a little, but the black streaks are still there. I should note I don’t have an ultra super smooth clear coat paint finish like on a car so it likely allows the black to embed on the pores of the paint surface worse. Still, I buy a product like this to dog down into the pores and destroy the black. It only helped a little.

This is the best aluminum gutter streak remover I have ever used. Just wipe/spray it on and wipe it off with a separate cloth. Amazing results on my 16 years old streaked gutters. HOWEVER, there is no warning that if left on your hands for an extended time, like I did using a soaked sponge from a bucket, then you will have sores and red marks all over your hands afterwards. My hands burned and I developed horrible rash like symptoms. The bottle does not give any warnings about getting on your hands, just talks about your eyes. I had blisters and small open sores all over the backs of my hands. After looking at the spec sheet for the product it says it contains acetone! No wonder it burns your hands, you are NOT supposed to have your hands in acetone for hours at a time. After days of my outer skin layers peeling off I was finally back to normal. The next time I used it I used rubber gloves!!!!

Awesome cleaner. Used it on RV, boat, and boat seats, great job. Took off catfish slime and streaks from boat easily.

We were looking for something to restore the panels on our Haulmark enclosed trailer. The trailer is 23 years old it has been at least 8 years since it has had a proper cleaning. This stuff works great! This photo is after I tried cleaning the first panel and I will likely go back over it again it to get the nooks and crannies and residual streaks. It does take some elbow grease to scrub the black areas with a rag so the job went faster when I used my battery powered scrubbing brush (found on Amazon). I highly recommend this product. Also, the jug didn't leak during shipping.

Pas besoin de frotter fort et toutes les traces noires disparaissent sans tracas. Je l'ai utilisé sur un revêtement d'aluminium et je le conseille à 100%. Vous ne serez pas déçus. Pas besoin de rincer et laisse beaucoup de brillance.

Clean black streaks absolutely 100%

Really does work on baked in black streaks. Does require some rubbing and scrubbing but it gets it near new!

This product is the only one I have tried that removed black streaks on our pontoon boat. It really improved the look as the accumulation of black streaks over the years looked terrible. I find spraying directly on the streaks works better than on a rag. On the picture the left side is done.

I really thought this would be great given all the good reviews. It takes a lot of manual effort to get the gutters clean. I didn't have a lot of build up yet I couldn't see where the white gutters had oxidized so it removed some of the finish in a few spots. It says to not clean on those areas. It did removed some of the overspray from painting the house on the metal soffits! That was a good bonus. After noticing that it took off paint, I was even more cautious to make sure I didn't overspray on the siding. Spotty looking finish with removal of black streaks and spots even going over it again. It seemed that the cleaning only happens on the first spraying of the product so if it wasn't wet or dense enough, I was left with spotting or what looked like smudges. I used it full strength as was suggested. Not impressed and for the price....... I will look for something else next time.