I've finally found the best laundry spot remover and it's inexpensive and homemade!!!
It works great on already laundered T-shirts. Takes out ring-a-round the collar and even grease spots. Even old ones.
Laundry Spot Remover
1 cup Dawn dish soap
1 cup ammonia
1 cup water
Mix and pour into spray bottle.
I keep a small bottle in our closet and spot most of the clothes before they are put into the laundry bin. The larger bottle is above the washer.