I don't have a review of any of these types of dips or sprays but I would not use tea tree oil and leave it on. I don't even like using it in shampoo. If they can possibly lick it off, no way.
Sergaents makes a product with similar ingredients/essential oils. I'm not sure if it works for fleas or not but there are a lot of complaints about reactions just because the oils are so strong.
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