[Nickthedentist]

Hello again,

I would tread very carefully!

Clock dials from the same era are similar, i.e. screenprinted onto a thin metal (aluminium?) sheet. Get it wrong, and the appearance of the finished piece will be ruined!

Firstly, brush off any dust or loose dirt with a soft, dry brush.

Then, I would either leave well alone, or clean under running, lukewarm water with some mild soap on a pad of cotton wool, then blot dry with a microfibre cloth, but only after testing a small inconspicuous bit to see that it's safe to do so. If the printing looks flakey or fragile, then don't even try this.

Cleaning the (plain) glass so that it gleams will really help make things look nice, even if the printed dial underneath is less than perfect.

Nick