I use a tablespoon of castille soap, a tablespoon of olive oil and about 10 drops of both lavender and tea tree oil in a spray bottle filled with water. It lasts about 2 weeks. But half the time I'm changing him in a different room and just run the wipes under the faucet. Both clean equally well, but I like to think the solution is nice for his skin.
We just use water straight from a warm tap, it works just fine.
I used to use water, a dash of oil (veg/olive etc), a few drops of tea tree, some lavender and some sweet orange oil. I don't bother now, it's not worth it and I've read that if you dilute tea tree too much it's counter productive.
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