Yamaha Bassoons Owner's Manual page 12

Maintenance
Bass Joint and Bell Joint
Maintenance
A cleaning swab (for the double joint) should
be run through these sections about every
other month to remove dirt from the
instrument's interior.
■ Instrument Maintenance
Use a polishing cloth once or twice a month
to wipe the instrument's surface.
Key and Pad Maintenance
1.
Use a polishing cloth or silver cloth to
wipe the key surfaces.
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2.
Apply a small amount of key oil between
the key and key posts about once a
month.
* Wipe off any excess oil.
3.
Use a tone hole cleaner to remove the dirt
or dust that accumulates between the keys
and body.