Wool shrink questions

Hi.I was wondering if wool shrinks when it's in warm water or hot water?also,can a person use any detergent for it?does a person really need to buy special wool detergent for it?what do you guys think?any opinions on that?also,does cotton yarn shrink too?

crochetknitfan,
Why don't you try Google for these kinds of questions. Google does a lot of research before they post so you should get a good many responses to your questions.

Spoula