Tide to go is a wonderful product and does work on fresh stains but when it comes to old stains Tide To Go cannot and does not do a good job at getting old stains out of clothing.
The Tide To Go is meant to get fresh stains out of the clothes when they happen and not meant to remove any stains that are old and set in.
You can use vinegar and baking soda to get most old stains out of clothing.
Take some vinegar and saturate the stain in vinegar and then rub the stained spot with a paste made from equal parts vinegar and baking soda.
Then if the stain is being stubborn to come out you can also add a couple of tablespoons each of vinegar and laundry detergent to a bucket of water and soak the garment overnight if the stain does not come out.
Then wash the clothing in the washing machine and the stain should come out.