Sorry to necro the thread, but just wanted to point out that I use bentonite and it is a really good clearer. It takes a bit of stuffing around to use but you can clear a wash in as little as 2 hours using the stuff (although I would suggest waiting longer than that). I've used crash chilling, gelatin, bentonite and turbo clear. All of them except gelatin work really well on sugar washes, but for me, bentonite is the most cost effective.
I can get 1kg of bentonite for around $10 and I use about 10g per 20L wash. Thats only 10c a wash! If you would have to buy a fridge to use then you would probably have to do over 1000 washes for it to be more cost effective than bentonite. But of course the cheapest method is time, but if you like to clear a wash in about 24-48 hours then I would suggest bentonite.