did you mean without drilling out the 'dreaded rivets' (as you had done in the past) so as to open things up as far as is possible or wash it without removing the rivets?
I think if you washed it without drilling out the rivets so as to enable complete disassembly it might prove difficult to get it completely dry.
What failure mode is the keyboard operating in? If it is groups of keys that are not responding, then the problem is almost certainly the interface between the circuit board and the Mylar sheet with the circuit traces on it. This must be very carefully cleaned without rubbing so hard that the black carbon traces are damaged. These can be refreshed with a soft pencil. But, to do so you have to take out the rivets to get to them. Proper alignment of this interface upon reassembly is absolutely crucial.
tanstaafl.
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