A hardware store for those 1-inch or ½-inch, white-bristled brushes
called "chip brushes" from their use by machinests to brush metal
chips away from a cutting bit. Also try the net or ebay for them.

If you buy a few dozen, they can be, maybe 20¢ each. Just throw them
away after use.

Pixmaker in FLL
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It's not the heat, it's the humidity!
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(..Think the humidity's bad?
You should watch us vote!)