Yamaha 400 Series Owner's Manual page 13

● Pad maintenance
1 . While the pads are still wet, insert a piece of
cleaning paper between the pad and the tone
hole and completely remove moisture from
them.
13
. If the pads are still sticky, use a piece of powder
2
paper to remove the stickiness.
Cleaning paper
Powder paper
● Cleaning the exterior
Taking care not to apply pressure on the keys,
use a polishing cloth to wipe away fingerprints or
oil from the instrument's exterior.
* When cleaning the keys, take care not to
damage the pads.
Polishing cloth
Polishing cloth