This is what I make and it does work but scent killer is not a sure thing all the time.
16oz. Hydrogen peroxide
16oz. Distilled Water
1/4 cup Baking Soda (I use 1/2 Cup)
1 oz. liquid Unscented Soap
Mix Ingredients together in large bowl until baking soda dissolves. put in a clean Gal. Jug.
such as a laundry jug or bleach bottle cleaned out. Don't use a clear milk jug the peroxide will break down in a milk jug in light. try to store gal. jug in dark place. caution after 1st making and putting in gal jug leave cap off jug for a day or 2. if not pressure from Ingredients will blow cap off. also some may flow out jug so put paper towels under it or in a place like a sink until you put on cap. I can make gallons of this for what they want in stores for 99% scent killer. I have been using this stuff for years now with great success.