I used your two-part resin successfully with 2 different molds and was very pleased with the outcome, BUT, the second time I used it, I guess I didn’t put enough of the hardener in? and the resin is still liquid. The one mold is easy access for demolding & cleaning, but the other mold, is a very small tear-shaped mold that has a small opening, making it much harder to demold. Being that they are both still liquid, how do I clean them once I get the resin out??