I never like to do the "go search" thing, but this has been discussed in great detail on a number of occasions. Textile experts like DFTowel have covered it very, very well. Try searching on his username.
Short answer: other than avoiding fabric softeners you won't damage MFs unless you do something very weird. HOT water is OK, so are virtually all cleaners/detergents, and home dryers don't get hot enough to damage them.