In article , rickman wrote:

not safe to use without checking the materials in use. There are many
products that are specifically intended as contact cleaners which don't
cause these problems.

Bizarrely, there are contact cleaners designed for that which DO
cause problems. A can of RS "Switch cleaner" made a bit of a mess of the
inside of the plastic case of an old radio, by melting the black plastic
into runny black goo.

Cleaned the wave-band switch a treat, but I'm glad it only puddled in
the inside corner, and not so much the outside!

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Mike Brown: mjb[-at-]signal11.org.uk | http://www.signal11.org.uk