How do I acquire a tomato sauce stain out of a purple Ralph Lauren 100% cotton sweater? I tried shout stain remover but it did not work. It has...

I tried shout stain remover but it did not work. It has be machine wash once in cold hose down.
Answers:    keep it showery w/ water and bring it to a dry cleaners and own it professionally cleaned.
Shout isn't very right at tomato-based stains, IMO. I prefer Zout. That plus Biz (and enzyme-based stain removal product) usually does it.