I like to keep my car clean, but am usually satisfied with a regular hose down, just with cold water, and sponge/leather off. Every now and again, I succumb to the temptation to try a polish, but I'm convinced it's not worth the effort. Occasionally, for masochistic fun, I polish half the bonnet just to see if it fares any better - nope, can't see the difference a week later. Tried RainX on the windows on one side of the car this week - again couldn't spot the difference. Similar story with alloy wheel cleaners (although I admit they're necessary for the worst grime). So are all these products a complete waste of money - or am I missing something???