https://www.amazon.com/CRC-05103-Electronic-Cleaner-11/dp/B000BXOGNI/ref=sr_1_6?crid=1VIXU7GYLEF2X&dchild=1&keywords=contact+cleaner+electronics&qid=1611961295&sprefix=contact+cleaner,aps,155&sr=8-
VERY IMPORTANT ADVICE: When spraying items [small bursts] ... make sure that you TWIST or MOVE the KNOBS / Switches in maximum up/down ... left/right positions ... and 100% rotate knobs back and forth several times. This will clean the contact surfaces like a Pro Technician.