My sons football top has been left, damp, in his sports bag for the last 2 weeks. Its got black spots all over the front - Ive tried soaking it in Ariel stain remover but the marks won't shift! He has only had the top 3 months, it was a birthday present so I don't really want to throw it out if it can be saved. The top is red and white stripes. You can hardly see the spots on the red stripes but they are very noticable on the white. Any advice for removing please? Thanks!