No, I wouldn't advise getting water near anything like keyboards or other switchgear. If you think it's something sticky, then get some Deoxit D5 which is a switch cleaner - you can buy it on Amazon. I can't recall the formulation but it's not water based and is well respected in the electronics industry.
I vaguely recall seeing another post on some LR forum where the collapsed switch wasn't due to anything sticky but you could get the fascia off the radio in order to fix it. Someone else may be able to find the post.