I am all for homemade products and saving money, but I would look into the Lysol idea further before putting it on a horse. It is a germicide, you would never put it on your own skin. Personally, I hold my breath and apply it carefully when putting the aerosol version in a trashcan. It may have a smell that repels flys but I would be really concerned about the long term effects of putting it on the skin of anything.