My apologies, I miss read the question,,,,,,,,,,,,I assumed perhaps a "clean-up". The solvent used is a siloxane complex, Dow and GE have condensation type reaction process' that enable the solute to become a concentrate, again for what its worth, I would simply suggest you contact GE...
In relation to Potassium Dichromate with Viton rubber, there is no problem, I am assuming the temperature would be around ambient conditions. Viton is still OK at elevated temperatures about 150C, but the life of elastomer will obviously not be as long. Sorry I cannot help you with your second...