Why does it stain when you sweat?

When I have a hard jog I sweat a lot. My white t-shirt is soaked. When I take it out of the linen basket 3 days later to wash it, it is covered all over in bright pink blotches! ...show more

I have an ink stain on my velour sweat suit. I'm trying to figure out how to get it out. Do you have any suggestions?

i've got a few light colored shirts that i really like from when i was younger and hadn't found a good antiperspirant yet. they have stains in the pits and i want to remove it. i haven't tried anything special on them yet. does it make a difference if...

I have a white shirt that I really like to wear, but I can't because there is a Light Brown kinda looking colour stain on it. Right underneath the armpits so it is a swear mark stain. The shirt is white. I have tried to use Tide but it didn't help to...

I got a toothbrush and scrubbed my white sweatshirt with bleach and water. Now there is a bleach stain. I was wondering if it was possible to get the stain out. It's kind of yellowish .

yes its really a sweat stain, nothing else :)

My cousin had prom and unfortunately it was hot and she has a hot of an underarm sweat stain in all her photos. I used to use Piknic.com but there website closed down and was bought ...show more

http://i66.photobucket.com/albums/h276/Lercin/IMG_20120212_154739.jpg http://i66.photobucket.com/albums/h276/Lercin/IMG_20120212_154751.jpg idk what to do!! i think it got worse cuz i took some powder detergent with cold water and tried to clean it,...

I ran yesterday and when I came home and took a shower, I noticed that along the edges where my sports bra had been, it looked like a bruise. Then I noticed that the entire inside of my t-shirt was light gray-ish purple, especially dark under the armpits...