“Varnish” is not a common thing on dials that I’ve inspected.
I have many dozens of dials from the Thirties onwards, remnants from the watch repair shop I bought from a friend. Most are NOS but others used. Very few are badly damaged even though they’ve been laying around in a drawer.
What damages dials? Moisture, oil, deteriorated lume, fingers, tools, dropping them, etc.
The only cleaning I was allowed to do during my apprenticeship was blowing off dust with a small bulb blower, light brushing with a special dial brush, or cleaning shiny parts with Rodico (watchmaker putty). Not more. No moisture, no chemicals, no touching.
That said, there are companies (such as the original manufacturer) that can repaint or repair dials - and this is worth consideration if the watch’s value is primarily sentimental rather collectible.
From VC itself — I personally would not worry. Their manufacture and skilled staff are awesome.
That’s my 2¢ anyway.
Mike
PS - https://www.watchprosite.com/page-wf.forumpost/fi-876/pi-9878626/ti-1210621/s-0/t--deliberations-on-dials-part-1/