Originally posted by JinDesu I have the Eclipse sensor swab solution, which is fast evaporating alcohol, and since I've run out of swabs I started using the solution to clean the grungy parts of the camera. I'll turn my camera off, squeeze a few drops onto the shutter button, and press down hard with a cloth while using my fingernails in the cloth to get around the button. This has been pretty good for me and I don't think it does anything bad to the camera since it evaporates so fast.
My sweat is a bit dirty so it accumulates stuff into the shutter button quite often.
That solution is probably alcohol, which may not be good for the rubber weather seal. I'd rather use a mild detergent such as hand-dishwashing liquid or liquid soap. By dishwashing liquid I mean the one use for washing dishes by hand,
not the one used in a dishwashing machine - that may be too aggressive on the seals.
Probably best to start with undiluted soap, then diluted with some water to make it more runny and finally rinse with clean water.
Edit to add: What I say here of course applies only to weather sealed cameras. If it is not weather sealed then the opposite is true - alcohol would be quite safe (but not entirely so) while soap and water would be lethal.