What form was the "retouch varnish" in when you used it, and did it say you had to thin it before use? The stuff I use comes in a spray can, already at the right consistency.
If it didn't say you had to thin it first, then I think you're fine.
As for removing it, it depends on what kind of varnish it is. If it's a damar varnish, as most are, you need turpentine to remove it. Mineral spirits isn't a strong enough solvent.
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