How to clean inside Amps and PreAmps

George, I take your point, but such is not the case where I live.

If Gary (Hifigeek1) catches this thread, I hope he weighs in. Gary is an ARC authorized service tech and knows his business well.

Nothing wrong with compressed air in a can. Just keep it upright and it won't freeze anything. That's why it comes with a long tube. It's actually the best if your starting with a pristine surface. Once you get the heavy gunk off, it's still the best.

If this is a problem for you, consider my solution. I use Jeff Rowland Design Group S2 integrated amp but the following information applies to most, if not all, of his equipment manufactured in the last 20 years.
Rowland gear is sealed - no vents for dirt or dust to invade. The entire chassis serves as a heat sink. When you open any of this gear, the interior looks just like it did the day it was closed at the factory. I imagine this is why JRDG components have such high resale.

Thanks for that info, Macrojack .
Never knew that about Rowland stuff.

Actually the Bosch came up with the laundry machine especially made for washing the Amps/Preamps.
They still working on a dryer