Guys, what do you use to keep the front spoiler clean and black? In the past I've used no touch tire spray or GM tire treatment. I noticed when I changed from Rust Check rust proofing to Krown, the Krown litterly made my front spoiler worp and wavy and they did nothing to correct the problem but laughed and blamed it on Rust Check rust proofing I used from 1990-2004. I told them I'd never go back to Krown and tell friends about their customer attitude. I did get another used spoiler near my area.