Hi folks! I make resin soap dishes embedded with stones with Environmental Technology clear casting epoxy. I must have made a mistake in measuring because now 18 hours later they haven’t set up at all. I’m really not sure why because it sure seemed like I measured carefully. Anyway, what I’d like to know is how do I clean up this mess from my molds?? I’m bummed about wasting the product but I need to be able to use these molds again. I can dump out the stones but there will still be a sticky mess in all my molds. The molds are polypropylene. Thanks!