Can confirm rubbing alcohol can improve your experience with failing phone charge port. I got to the point with one where it wouldn’t charge unless I applied a minuscule amount of alcohol around the metal prong in the phone with a shaved down toothpick before plugging it in. This tip is mentioned exclusively for those trying to extend the life of an end-stage phone and I take no responsibility for any fires or harm to the phone.

That said, there were never any problems when I did it and it extended the phone’s life maybe 8 months, and after a few months it didn’t even need the alcohol. Maybe it improves conductivity or used the charger head to over time clean the phone port. This was a micro-USB charger because I like using 8 year old, $60 phones.