down at the po we just sprayed some 409 and held it upside down, so it
wouldn't hit the
membrane.  then use a medium flat blade screwdriver to clean between the
keytops
we did this about once a month cuz of all the dust on the workroom floor.
 never had a failure.    here at home I once tried taking one apart that
had already failed.  I washed the
PCB with alcohol and a lint free q-tip . it worked for about 2 weeks. 
good luck,  Jerry
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