Yamaha XZ550RJ 1982 Owner's Manual page 247

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4. Once the majority of the dirt has been
hosed off, wash all surfaces with warm
water and mild, detergent-type soap. An
old tooth brush or bottle brush is handy
to reach hard-to-get-to places.
5. Rinse motorcycle off immediately with
clean water and dry all surfaces with a
chamois, clean towel, or soft absorbent
cloth.
6. Chrome-plated parts such as, forks,
etc., may be further cleaned with auto-
motive chrome cleaner.
7. Clean the seat with a vinyl upholstery
cleaner to keep the cover pliable and
glossy.