There's several I've personally tried including magic green powder, stuller's pink solution, Rio grande both clear and pink ones, and others. Unfortunately the best kind so far is ammonia. Another good one I have tried frothing is goof off orange oily stuff. I dipped once in that then in plain water that's in the ultrasonic and everything just flies off like bats out the gates. Again proper ventilation and mask is preferred. Feel free to share your experiences.