I bought an ultrasonic cleaner to clean my fuel injectors. It appears very difficult to get a recipie for the liquid to clean in. I think using distilled water is best. At about 60 degrees celsius. What fluids are good to use? I understand that petrol deposits a kind of 'varnish' that can clog up the injectors. Acetone, isopropyl alcohol, degreaser are some of the things I've tried. Is there an optimal diy mix for various things one might want to clean in an utrasonic cleaner.