Suppose you're a bit of a klutz like me and stains attracts themself to your clothing as if you were a great big dirt magnet. Don't reach for those harsh chemical cleaners, just wash the garment in the normal way and then stick it out in the sun.
I've done this with a white T-shirt with a stubborn red wine stain. Five days later and there's no trace of it. A previously unwearable piece of clothing is now as good as new. The secret of this nifty trick is that the high energy photons in the u-v band break down the molecules that are the building blocks of colour. Try it and see. It's the perfect excuse to crack open a bottle of Cabernet. Just be careful that you don't use too much for experimental purposes when splashing it down yourself!