One thing you can try is DeoxIT.

Just adding on that I’ve found white eraser to also be very effective on contacts, altho getting the right size for the cart can be somewhat of an issue, depending. But they’re cheap, last a long time, and are very gentle on contacts. You might think of it as a first or second-line cleaning tool, before breaking out the DeoxIT.

@bridgeenjoyer@sh.itjust.works