Welcome aboard. Do you have a soft or hard cover? I have the soft cover. Most of the time I just wash it, but when it gets bad, I use a convertible top spray. It gets off any nastiness that the sponge and soap won't.
Kinda depends on the type of cover you have, really. I have the Undercover Classic which is pretty much just reinforced plastic. I use meguiars Vinyl/rubber/plastic protector. Keeps the cover shiny and protected from UV fading/cracking. Car duster now and again keeps the pollen off of it to keep it lookin clean!
When I bought my Extang tarp, the speed shop made it very clear NOT to use armor all on it. They said soap & water -or- Extang's own cleaner.
They said it would void the warranty & that Extang could test any tarp returned and tell if armor all was used on it..
I've been washing truck and all W/ powdered Zep brand truck wash, pink stuff used to have it in a fiber drum @ work & I'm down to about a pound or so...
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