CCleaner here

Works great. You won't believe how much useless junk it removes (just look at the file list if you're curious)

It also has a built in registry tool.

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1982 240D, sold 9/17/2008
1987 300D TurboW124.133 - 603.960, 722.317 - Smoke Silver Metallic / Medium Red (702/177), acquired 8/15/2009
262,715 and counting