Not that familiar with capacitive switches, but by saying capacitive, 
are we not saying 2 conductive (or at least partially) surfaces with a 
dielectric substance between. In this case one surface would be either 
the switch surface, or maybe a thin material between. The other 
conductive surface is normally a human finger. In the "in a pretty 
hostile environment", I can picture the human wearing heavy rubber, 
leather or other material gloves that may or may not be coated with 
water, grease, or other materials.

What happens??  :)
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