From various posts it seems like we have a few car guys around here. I've seen a couple examples of people using their car care supplies in restorations/clean-ups. For example:
@greenweb used a clay bar and cleaner wax on his red mastertouch
http://weberkettleclub.com/forums/weber-kettles-accessories/master-touch-tribute/msg228055/#msg228055
@Cellar2ful used 303 Protectant on the table of his OTP
http://weberkettleclub.com/forums/weber-kettles-accessories/online-listings-seem-to-come-in-waves/
Then there is the tried and true Mother's Mag & Aluminum Polish for legs/other aluminum parts.
So what else is out there that people are pulling from their garage and using on their grill(s)?
You can use back to black on the plastic wheels to deeper their faded color
My go-to for vents and legs is Simichrome. Some other good ideas in this thread:
http://weberkettleclub.com/forums/weber-kettles-accessories/polishing-aluminum/ (http://weberkettleclub.com/forums/weber-kettles-accessories/polishing-aluminum/)