Polishing the keys on a Hammond using a high speed polishing wheel.
CAUTION MUST BE USED!
DO NOT try this on diving board type keys...they will melt!
I do not know what type plastic is used on any other make organ, so be aware that you can damage a key very easily.
This can be dangerous...please use all precautions for this type of equipment!
If you have never done this before, practice on a spare key.