I've been going nuts with my $22 deep fryer. The thing I don't like is having to replace the coconut oil I use. It starts to get expensive. But here is an interesting article at Serious Eats about how to clean fryer grease using gelatin. I'm going to try it!
Holy cow, this may have really worked! I was left with a solid disk of gelatin, filled with specks of burnt flour and other assorted gunk. Everything was looking great so far. Now for the true test: Could I cook in it?
I heated up the clarified oil on the stovetop and was alarmed, as it started bubbling a little while heating—an indication that there were still at least a few microscopic droplets of water in the fat—but with a little shaking, the bubbles soon completely dissipated, and the oil continued to heat up just like any fresh oil would. Once it hit the desired temperature, I fried a few pieces of green bean tempura in it, followed by a small batch of fried chicken. Both recipes came out perfect, as if they'd been cooked in not-quite-fresh-but-still-super-clean oil (bear in mind, this oil was on its last legs before I filtered it).