There's a link to the algorithm on the left side of my front page.

If it's any help, one of my friends says that clothing donation places have people they pay to mend the clothing which is donated, so anything unstained that can be mended will be.

If the T-shirt is one you love, I would not throw it out! I would save it and maybe use the front or back for a T-shirt quilt, or store if for a while longer intending to make a T-shirt quilt until I let go of that particular idea!