Go to your local drugstore - CVS or Walgreens - and head for the cosmetics section. Look for cometic brushes, used to apply and smooth various facial cosmetics. They have very soft, bushy, dense bristles and come in a variety of sizes. I find them very handy for dusting audio components, especially turntables and ARC faceplates with recessed toggle switches, etc. The right sized ones could work very well inside the chassis of a tube amp.
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