3. Using acetylsalicylic acid found in aspirin drug:
[1] Put the wire (end) on top of the aspirin tablet.
[2] Now using hot soldering iron, press against the wire (and tablet).
[3] Hold for 2-3 sec, then check for removal of coating.
[4] Repeat the process if necessary.
[5] Clean the wire.
This can be combined with usage of smooth sandpaper (see 2).
