Just be careful. It's not common but let me tell you a nightmare story of mine.
My brother in law doesn't clean his machines out at all and he was having trouble with one of them, so I came over and there was dust inside so thick it was completely matted into an almost cloth like substance. I carefully tried to clear out as much as possible, starting it up afterwards the power supply dead shorted and the smoke came out =) I'm guessing during cleaning a piece of it got jamed in the high voltage section of the power supply and it fried when it powered up.
I have a scope almost as old as me as well, it's a little flakey, turning it off and back on cleans up the trace when it's skippering about and the pots are a little flakey sometimes usually from sitting in the same position, running them back and forth from each detent a few dozen times tends to help smooth out any dust on the pot's or anything.