The controller circuit board is a little moldy, and some chip pins are a little oxidized. Can I spray wd-40 General rust lubricant for cleaning?

Yes, but be careful not to get it on the plastic.

WD-40 can peel off the oxide and attach it to the metal surface to prevent re-oxidation. WD-40 is insulated, so there is no need to worry about its conductivity. However, some data show that WD-40 is harmful to some plastics and rubber, so to be on the safe side, try not to get it on plastics.

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