On Sunday, 3 March 2019 21:42:21 UTC, D.M. Procida wrote:
I have some ceramic electrical insulation, that is a bit discoloured and
I would like to clean up.

It has a rough unglazed surface.

What do you suggest?

Thanks,

Daniele

If it's old, beware, a lot had near zero tensile strength and will crumble just from doing a screw up. 1st move I'd recommend is dishwasher. It's effortless and removes a lot of things.


NT