I am so grossed out right now.
I find it funny that some of the commenters are referencing Victoria's Secret and their "expensive" bras as to why they don't wash them. No, they get all funny 'cause those bras are overpriced pieces of crap-that I wish I could wear because they are so cheap. I wear a 34H, so a good deal is a $125 mail order bra. I have 3 (inexplicably lost the 4th in the past week; methinks it is somewhere in the clothes tsunami in my bedroom) and I wash them in the machine, sometimes in cold, sometimes in hot, sometimes in a mesh bag, sometimes not, but
1. don't put them in a machine with an agitator and
2. NEVER PUT THEM IN THE DRYER!!!!!!
My bras are lacy and pretty and stay that way. They usually last for 3-4 years.