Did he mention the name? "Solvent H" perhaps?
Some watchmakers use this to clean dials - all dials. To me using any sort of solvent on a vintage dial is insane, but I know at least one watchmaker in the US that ruined a dial doing this - he sent it back to the customer without even mentioning it. That customer then contacted me about it...asked my view on what to do. This is the watch - all the printing was intact when it was sent to be serviced:
If the solvent is taking off printing, calling it "not harsh" seems a little bit odd.
Of course you need to clean debris off the dial, but taking shortcuts like dunking it in solvent is very risky. The safer but much more time consuming way is to use methods like these cleaning sticks to remove each piece of debris directly:
You pick each piece of debris off the dial individually:
So yeah, some guy taking a shortcut by dunking your vintage dial in solvent - yes you should be mad.
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