a good alternative to using emery cloth for contact cleaning is crocus cloth, which actually serves more of a polishing function. Sorry for going off-topic, but since we're already there...
Abrasiveness factor of crocus cloth is extremely light if any at all. Rub crocus cloth across your finger tip and it is very smooth compared to emery cloth, with which you can actually feel layers of skin being scraped away.
I use crocus cloth to polish away any oxidation surfaces from cables, fuses, switch contacts, relays, connectors, tube pins, phono cartrige pins, etc. It will not remove metal plating surfaces, just polish shiny bright.
Abrasiveness factor of crocus cloth is extremely light if any at all. Rub crocus cloth across your finger tip and it is very smooth compared to emery cloth, with which you can actually feel layers of skin being scraped away.
I use crocus cloth to polish away any oxidation surfaces from cables, fuses, switch contacts, relays, connectors, tube pins, phono cartrige pins, etc. It will not remove metal plating surfaces, just polish shiny bright.