If your bike is always on the car, its obviously not a great bike or one that you baby, so go ahead and hit it with the pressure washer. Just don't aim the spray directly at the bearings.
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Il faut de l'audace, encore de l'audace, toujours de l'audace
1980 3Rensho-- 1975 Raleigh Sprite 3spd
1990s Raleigh M20 MTB--2007 Windsor Hour (track)
1988 Ducati 750 F1