The various range switches on my oscilloscope obviously collected some dirt over the years. Sometimes the input attenuators show a frequency dependent response (just like poorly matched probe) and the timebase wiggles all over place. It is a fully analog scope and I have full service manuals.
I've seen spray cans used for cleaning these switches, are they any good for this kind of job (measurement equipment)? Are there particular types I should avoid? Are there particular techniques / best practices to clean these switches?