A great DIY spray is to add 1 tsp of baking soda and 1 tsp of blue Dawn dish soap to a bottle of peroxide. Spray and let dry. *Always test a small area first
Add in 1/2 cup of dried lavender and blend. Essential oils work too but aren't as strong as a scent. Orange peels or lemon peels are a good option too.
Stains are gone and mattress has nice fresh scent. Do once every few months for a refresh.