[apope]

Hi, I really need a bit of help to start writing my paper on this question. Any help would be very VERY greatly appretiated. Thanks in advance.

"Various consumer products and books exist to help people remove stains from clothing, carpets, etc. Discuss how a knowledge of polar and nonpolar substances is related to the removal of stains."

[Yggdrasil]

Stains are removed by dissolving the molecules which make up the stain.  There is a rule which says which types of molecules will dissolve in polar and non-polar solvents.  What is this rule?