Go call him out at his place of business- I'll bet he's made comments at work about how he gets his car detailed free because he throws so much work your way.

If his boss is around you should be able to impunge his reputation nicely.

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95 E300D gave away
77 300D, 227k, station car
83 300CD 370k, body gone away to the rust gods, engine is in a Yota pickup, going strong
89 190E 2.6- 335k, no more
79 VW FI Bus- 154k summer driver
59 VW Beetle ragtop- 175k
12 VW Jetta- 250k
74 MG Midget-78k