★★★★★
I got rid of a large one with a mixture of peroxide and horseradish sauce (horseradish, vinegar, salt, water). I'm thinking that was the combo, but I'm not sure, I have to get more horseradish and try it again. Just the kind of horseradish sauce you make at home. I put the peroxide on it and then while it was still damp rubbed the horseradish into it real good. I only did it once or twice. The brown spot turned a lovely shade of lavender and puffed up a little, and then faded away in just a few days. It was either apple cider vinegar or regular white vinegar. Sorry I can't remember. The store hasn't stocked horseradish root for a while and the jars of it all have mystery ingredients... So I wait...
