The favorite cleaner for these juke parts is Westleys Bleech wite tire
cleaner .
Take the whole keyboard out of the juke & spray it down with this stuff
& with a paint brush scrub around a bit for a while then hit the whole
thing with a spray from the garden hose and watch all the grime just
wash away . it wil not remove rust . Blow the whole thing dry with
forced air .. i use a shop vac with the hose plugged in the blow out
port with a crevice tool on the hose that will blow the water out then
use a good contact spray & oil all the moving metal parts levers e.t.c .
I do this with all chassis & mecks .. You must use caution however and
know what to remove on some units so water wont get in them .