I had recently been looking for some black streak remover for our RV, nothing seemed to be doing the job. I tried several different brands and it still did not cut it. Finally, I came across RV Parts Country and their selection! I purchased the Thetford brand and it works great! One of my biggest concerns was using something that would fade my decals and this did not at all! I purchased the one gallon due to the price being so low! I definitely recommend, best one I have ever used for my RV!