By spilling spaghetti sauce on your shirt! Or bleach. Or shout.
You get rid of oil stains by using oxce clean
scrub it
Soda!
bleach is the most effective way to get rid of stains it removes all the dirt and cleares out the stain.
your mom
peroxyed
You can either soak your stained clothing in the bleaching agents or detergents to get rid of the stains.
Rub it clean with arsenic
orange...i think
If you think a man with orange stains in his underwear is cheating it's not true. Multi vitamins can cause orange stains and generally this means they are taking too many of the vitamins. When a man urinates no matter how much 'he shakes it' there is always a few drips and this causes discoloring in their underwear.
Try a little bit of Golden Syrup (see 'How do you remove grass stains?)
Try Resolve carpet cleaner, that worked to get most all of the stains out of my carpet when i moved.