KTM 790 Duke 2019 Owner's Manual page 244

20 CLEANING, CARE
242
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Treat the engine, the swingarm, and all other bare or zinc-
plated parts (except the brake discs) with a wax-based corro-
sion inhibitor.
Info
Corrosion inhibitor must not come in contact with the
brake discs as this would greatly reduce the braking
force.
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Clean the chain. ( p. 141)