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A varnish is a bunch of building blocks for a polymer in solution in a solvent. A thinner can be added to the solvent to dilute it. When the solvent boils off, the building blocks start to link up and form a polymer. Once the polymer forms, a thinner will not attack it. A stronger solvent may indeed attack it though.
A lacquer is a series of long chain molecules in solution in a solvent. As the solvent boils off, the long chain molecules intertwine and form a solid. When you add the solvent back to it, the solvent pulls at the long chain molecules and brings them back into solution.
If the spray paint is oil based it is a varnish. You will need a strong solvent to remove, but not one strong enough to attack the clear coat underneath. If the spray paint is waterbased, these are basically a combination of the two above... you have longer pre-built polymers surrounded by some long chain molecules that will dissolve in a solvent. When the water evaporates that carries these things, the little globules get closer, and a bit of solvent is carried with them, this activates, the globules inter-bind and it's kind of like bricks and mortar at this point. It is possible to attack this stuff with a solvent, but not with water.
Lacquer thinner though is a STRONG SOLVENT, it is not technically thinner, so maybe that is what Jayx77 had used. Paint thinner or mineral spirits or methyl hydrate won't give the same effect. All will just bounce off of the spraypaint, or should.
I'm no paint expert, but I know my wood finishes, and wood finishes are different from paint only in the carrying of the pigment in the binder.
If you're brave, try SMALL amounts of lacquer thinner, or SMALL amounts of stripper. But test first in an inconspicuous part of your car to see if it will attack the clear coat. WEAR STRIPPING GLOVES. And eye protection and long sleeve shirt, this stuff will burn you badly or blind you. Respirator too if in a poorly ventilated area.
The better approach is the auto body shop who will know WTF and will be able to fix it right.
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