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Hi Brian,
Happy New Year! Hope you have been well.
If you happen to apply mosquito repellent containing DEET, a wise choice
in your parts, it might be the culprit for the rubbery finish turning to goo.
DEET will do that. When you apply the repellent to your hands or face
and then make contact with rubber components and some plastics, the
DEET acts as a solvent. You put the item away in storage for a while
then next time you go to use it the plastic has become soft and mushy.
I've done it to the triggers on video cameras, on notebook keyboards
and to the backs of cameras where you hold them next to your face.
If you think it might be a possible culprit, the trick to avoiding it in the future
is to carefully wash and wipe clean any repellent that is on your finger tips or
around your eyes.
As for cleaning up the goo, alas I have never found a recipe for doing that.
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