I've done the oven method myself, spreading it in a pan and baking it for 30-60min. You have to keep and eye on it and stir it up often to get most of the moisture out. Worked for me but was a bit of a pain. I only had a small pan so I had to do 1 brick's worth in 3 separate shots, so it took me almost a whole afternoon!
Keeper of 5 snakes, leopard geckos, 1 green iguana, 20+ tarantulas, 2 dogs & a bunch of rats!