Questions about best way to use/apply the topical (this one was made with isopropyl alcohol) antifungal tincture:

*Is the formula made with rubbing alcohol safe to use inside a dog’s ears?

*Should I dilute it with water first, or would it be best to apply it full strength?

*Can I use the tincture as a preventive maintenance ear wash (dog), or would a different recipe be better for that?

Thanks