I've been asked a question on another forum that I can't seem to find the answer to. What is the recognized product, spray or otherwise that should be used to renew/preserve old rubber grommets and the like. I've heard everything from WD-40 to Armor All to Silicone and almost an equal number of responses warning against either the products or the propellants in the products. Nothing beyond opinions so far, so I'm hoping for a bit in the way of recommendations from manufacturers or good long term results. By the way, the item in question is a 1989 Honda motorcycle.