BMW R 1150 RS Maintenance Instruction page 56

Cleaning/care
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Aggressive or deep-action
cleaning products and solvents
should not be used to clean
rubber and plastic parts; they
may cause damage.
Do not use steam or pressure
cleaners.
High water pressure can
damage seals, the hydraulic
brake system or the complete
electrical system.
Correct and regular cleaning of
the battery is an important
factor in maintaining the value
of your motorcycle.
It also ensures that safety-
relevant parts remain in full
working order.