The "thing" with any thinner or paint remover is that they are not lexan friendly. As a general rule they are designed to bond to the lexan, or etch the surface, and all but imbed themselves into the surface - unlike most paints that just coat the outside of the surface. So they're hard to get off and out of the pores they create in the plastic.
And even the mildest acetone, which is the midlest of anything one can use, will (at the very least) dry out the plastic and cause it to crack later and will more likely (at best) terribly cloud the lexan and muddy any purther painting your attempt.
So it's best to just ditch it and start over...................
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