I deliberately didn't suggest the hair dryer or heat gun because of all the water. If you DO decide to use one, be ABSOLUTELY CERTAIN the GFCI works! Otherwise, don't use one.

GFCIs do work. When I was installing my liner a few weeks ago, it got misaligned and I had to pump the few inches of water from the deep end. The submersible's plug on the drop cord fell into the water and INSTANTLY flipped off! I wasn't touching it, but if I had, it would have saved me from a nasty, even deadly shock.