On 04/08/2018 19:24, TimW wrote:
On 04/08/18 17:25, wrote:
On Saturday, 4 August 2018 15:41:04 UTC+1, TimWÂ* wrote:
A blunt table knife seems to remove the
stuff without scratching the enamel too badly but it's very laborious.

Paint scraper

Is there a chemical solution? Even to soften it up?

Stovax glass cleaner has been mentioned.

Owain

would nitromors do it?

I don't think even the old Methylene Chloride "Nitromors" will touch the
worst of it. Boiling, strong sodium hydroxide solution probably gives
you the best chance. Not recommended unless you are used to handling
aggressive chemicals.

The lacquers from oxidised oils and greases are *very* chemically
resistant. Otherwise you are down to mechanical methods (wire brush,
sanding disk).