The problem with Tom's is it doesn't work well for some people. I've been using Kiehl's, which has aluminum, but is a cream so you can use a small amount. Every third or fourth wash, I'll make a paste with oxyclean and scrub the pits and the collar with a soft bristled brush. If you can allow them to soak a bit afterwards, even better. Removes 95% of the stains. This is coming from someone who does not wear undershirts.