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take it apart and wash and dry each key individually, then clean the frame.
if you mess up the orientation of where which button goes, it's not a problem... the manual should have a closeup... then reassemble.
to open, you gotta unscrew... and then carefully (will probably mar the plastic), pry it... cause it's popped closed aswell.
I do this like every year... my ti89 gets gunky over time lol
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