How do I get yellow stains out of undershirts?

Question

My husbands undershirts all have yellow armpit stains after about a dozen wears and washes. I use Tide in the wash and add borax to my white loads. It doesn't seem to matter whether or not I add bleach they are so yellow and I can't get them white again.

Answer 1

Soak in 1/2 cup oxiclean powder dissolved in a bucket of warm to hot water for up to three days. Refresh the oxiclean and water daily. That is how I got my yellow stains out. You can even do this to colored clothing.

Answer 2

try clorox, liquid

Answer 3

Use peroxide in your wash, or use bluing solution, try Oxy Clean.  Good luck.