I have had experiences with my menu not reading resistance correctly and my vape feeling a bit weak at times due to dirty connections. I used the ball point pen and alcohol dipped q tip to clean the positive electrical contact inside and it worked well. However, the brass post in the 510 connection didn't clean up as well. I scraped it with a small screwdriver the first time but didn't really like the results. Now what I do is tear off a small piece of melamine foam aka Mr. Clean Magic Eraser and use it dry (no need to wet it) and rub around on the pin with the pen cap (the part that clips to a shirt. BAM!!! Shiny. This stuff works good on springs and battery ends,charger contacts, etc.
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