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Yes, I agree, HOT water. I never use commercial cleaning products. I also had a leopard gecko. I don't even like the soaps that say safe for reptiles/fish. Get the water as hot as you can get it without it burning your hands.
Bleach is okay to use. Most go with a 1:19 solution, just be sure to rinse very well, sun dry, and use extra dechlorinator when setting the tank up, just in case.