Colgate Mouthwash staining teeth

Last night I used Colgate Plax Complete Care mouth wash. This morning when I woke up, there were brown marks on teeth, looks rotten. This is very unpleasant and highly embarrassing. I work with people and this is making my daily work life so uncomfortable. <br> <br> Brushing my teeth isn't helping, even tried s****ing it off but it looks like it's stained my teeth.<br> <br> This is extremely embarrassing!