A tip for your service bench. A little Deoxit D5 goes a LONG way! To make application easier, and also make a can last longer, I epoxy tiny 90-degree needle tip applicators (available on eBay or Amazon) to the plastic straws that go to the Deoxit can. It meters the spray and makes it much easier to get into the small holes in switches and controls. Cuts down on wasted spray, too! The right-angle ones are a little harder to find than straight needles, so here is a link to the ones I found;
https://www.ebay.com/…/Glue-Solder-Paste-Dispe…/302047106637