"Had a problem with a TV-remote. After having the same problem with new batteries I considered that dirty battery contacts could be responsible. One squirt of the product appears to have overcome the problem."
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Review 3 for WD-40 Specialist Contact Cleaner 400ml
"I needed to clean the electrical contacts on an Audi speedometer instrument binnacle which is basically a maze of circuit boards and delicate wiring. There are cheaper alternatives on the market but I decided to go for WD 40 contact cleaner because it has this directional spray nozzle and also states it is suitable for use on rubber and plastic. I sprayed it on some metal contact pins which had become tarnished with a black carbon like deposit. It took a fair amount of gentle rubbing with cotton buds and reapplication before I could shift this deposit. So it does work but is not a miracle cure, and it's expensive."