Notice:
The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.
I've had luck getting drops of varnish off, after a few days of direct sunlight until it hardens, then take a sharp blade/scraper and carefully scrap/'chip' it off. Then use a fine polishing compound and work any remaining residue off/out until desired shine.. (3M's Marine polish/wax)
jm's way is a good method and probably the easiest but the only problem I've had with that method is you could end up polishing off the gelcoat around the varnish, depending how much you dripped. You also cannot do this if the varnish is on the non-skid.
I brush some on and let it sit for 2 or three minutes, then brush it off. Takes a little work but 299E breaks up the varnish and the brass bristle brush minimizes the "rub-off".
When I bought my boat the PO dripped all over the deck (apparently wasn't very careful), even of the non-skid. It had also been sitting so long that really bonded to the surface. This was how I got it off.
Notice: The advice given on this site is based upon individual or quoted experience, yours may differ. The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.