Cleaning vinyl
While it may not clean, per se, WD-40 does a great job of preserving vinyl. Never use any of that armor-all crap or any silly-cone product. Vinyl is essentially petroleum with its molecules rearranged and moved around a bit. Why not use another petroleum product? I only use WD-40 for two uses now days (at least since they changed the propellant formulation and made it useless as potato cannon fuel....): drying out electrics and cleaning vinyl. There are far better products for lubrication and whatnot.
Cheers