So, I used MTG to encourage hair growth. It attracted SO much dirt. So I couldn't live with the oily dirt. I washed it then put mane and tail whitener on it. You know....the purple stuff that says let it set for 5 minutes, then wash it out. Well what it didn't instruct me to do was to protect her coat from her tail while it was setting. This is the result of the whitener coming into contact with her rear end. Live and learn!