Boric acid solution is very mild, soothing antiseptic. Years ago people frequently used it to treat Pink Eye. Used as an eye wash. Boil 1 c. water. Stir in 1/4 tsp Boric Acid until dissolved. I've been using this on my new senior Maltese/Shih Tzu. His tear stain condition had a fungal smell that filled the car when I picked him up. I've had him a month now. It has improved considerably with no odor now. I've also used a Lavender shampoo which is also a natural antiseptic.