Once the switch has been sprayed (meaning that the spray got to the inside of the switch) it should be rapidly operated about 20-30 times, else the treatment will do no good. Deoxit is effective but should be used sparingly. The trick is to get the smallest spritz into the body of the switch that you can manage.
Electronics cleaner
I have a toggle switch that just crapped out on me in my Audio Research SP11 pre amp. It's the "normal/ bypass" switch. It works on normal but sounds faint and fuzzy on bypass (which is where I like to keep it set). Should I try to clean it before I send it in to AR. Any suggestions which cleaner might work. I have a can of Caig DeoxIt and a can of CRC cleaner here. Is one better than the other, or could there be something else going on? I know I can call AR but I think I know what there answer might be.