Originally Posted by
123494
My pilot shirts have permanent yellow sweat stains by the armpits. I’ve worn undershirts and wash them after every trip but no luck.
BILLY MAYS HERE FOR OXYCLEAN.
Seriously, soak your shirts in hot water and oxyclean for a few hours. That should remove the pit stains if they're not ridiculously bad. Ideally you should throw a bit of oxyclean in with each wash load and that will keep the shirts white from the start.
Whatever you do, never use bleach - that is a guaranteed way to yellow the entire shirt.