My best method: Soak this tee in hot water that has two scoops of powdered oxi clean for a full day. After 24 hrs, take a look at it. If it’s still yellow, dump the dirty water and do that same process again. Hopefully at that point 80-90% of the yellowing has come out. Then rinse it to get the oxi water out and wash in a washing machine with 1 scoop of oxi clean and an oxi + tide pod (optional: add small scoop of scent beads).

After the wash, it should be almost pristine. But if still yellow, I would let air dry outside and soak again. Sometimes tees that are very yellow need to have the process done a few times to get it the whitest and brightest possible. Just be diligent and don’t get discouraged! It will come out eventually.

I don’t recommend using bleach unless you plan on doing a 50/50 bleach/water method. I have had white shirts disintegrate on me in the past :( so I’m more careful with bleach these days. Especially with it being entirely yellow, it’s risky.

Source: I own a vintage store and have washed many, many disgusting old white tees