Having dissembled several old products needing controls cleaning, I would say all these “spray in cleaners” are convenient but suboptimal shortcuts to what really needs to happen. It sucks, but those controls need to be either replaced with new, or themselves dissembled, cleaned, lubricated and reassembled. If you have done that, you will know why I say it.
As one example, a lever switch inside an old Luxman I restored used up both sides of four q-tip like cleaner sticks before it was back to new condition. Not everything is that bad of course, but don’t think it’s back to new from a spray.