Buy cypress from a trusted source and there is no need to bake it. If you bake it, it will dry out and negate the purpose, which is often to retain humidity.
If you are concerned, freeze it for a few days. I've never had any critter issues with the Repti or the cypress. There is no way I could bake any of it with the amount I use, but I will put a couple large bags in the chest freezer. There is no humidity loss when you freeze it.
I mix both substrates and only completely replace them every 6 months. I will spot clean and re-add most of the time. Keep in mind, I give all of the animals here a winter break and they don't produce waste, other than an occasional urate, from late October until late March.
The reptile companies that sell the cypress seem to sell clean product. I would not buy from a landscaping store or company that sells for home and garden purposes.
Good luck.
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