I've been starting seedlings for a couple of years now and find that the cost of sterilized commercial seed starter and planting mix can add up. I've seen various recipes for homemade mixes, but with all the warnings about using only sterilized stuff, I'm wondering how you get it that way. I tried sterilizing soil one time in the oven and won't do that again! I'm thinking maybe some kind of solar oven? I'd be grateful for any of your ideas.