Does anyone have a good tip for getting sweat smells out of clothing (armpits)?
I've got a cardigan that smells even after I've washed it. It seems ok at first but after wearing for an hour or so and the armpits have heated up a bit, the previous sweaty smell starts to release. It's really disgusting and I'm sure there must be a solution involving bicarbonate of soda or vinegar or something.
I've searched on the Internet but don't trust random sites and the often contradictory advice I've read. Anyone have any tried and tested methods they'd be happy to share please? 
Thank you.