Regarding CitraSolv or any other “natural” solvent –test it out by letting it sit out, ie, place a few drops in a metal tin (non-absorbant). If it evaporates away completely with no sticky residue – it should be okay. Scott (Gamblin customer service) tried Turpenoid Natural and it left a sticky residue behind which can turn brown; he recommends you just do the test first.
Note: I did this test with CitraSolve and there was a sticky residue. For this reason, and also because CitraSolve is a more powerful and sometimes irritating solvent, I no longer use this product.