A mix of Dawn, baking soda, and Peroxide works best.
One box of baking soda, 2 tbls Dawn, and a 32 ox bottle makes a pasty consistency and you rub that into the area and then rinse and repeat if needed. Ive tried that product and many others over the years as my dog is as dumb as they come! One year he got hit 4 times within 1 month!!!!!!
During that 1 month episode I had bought $40 worth of douches. Ive also tried the tomato juice method. This 3 part does the best out of anything on the market and the web by far. keep it out of the dogs eyes!!!!!!!