Corrosion on new charger point

It's a tricky one - I think paint should be a pretty long-term solution. For instance if it's car touch-up paint then paint thinners should get rid of it, and the Bangle's ABS plastic will be fine with that. As @halemmerich says, Acetone/nail varnish remover will attack the plastic though.

Tape is definitely a quick, very nondestructive fix though, and is easy to replace if it does come loose.