Use a dull knife to gently scrape off any excess mustard lingering on your item.
Flush out stain
Place the affected area (wrong side up) under your faucet and flush it out with cold water. This will get out as much of the stain as possible before moving on to treat it.
After flushing with water, fill the sink with warm water and drop in one Oxi Boost pod. Wait for it to dissolve fully.
Soak in Oxi Boost
Completely submerge the entire garment and allow it to soak for 1-3 hours. Rinse when done.
Wash the item as you normally would, using a Stain & Odor pod for extra stain fighting!
Dry in the sun
Leave your garment out to dry, preferably in the sunshine for extra bleaching power.
If the mustard stain is already dried and hardened by the time you get to it, rub glycerin into the stain and let it stand until it loosens, up to 1 hour. Then follow the rest of the steps!
Products to treat sweat stain:
Stain & Odor Laundry Pods, Oxi Booster Pod