You need to wash at 60 to get the grease and oils out of clothes. I usually wash my bra's at 40 which is a compromise, but handwashing them will do **** all to clean them. They say handwash on the label because then they are subject to less wear and tear so they last longer, and in case something does go wrong in the wash the manufacturer can say that you were in the wrong. Mine last long enough being machine washed anyway, I've never had to throw one away from being worn out.
If you buy decent padded bra's they don't lose their shape in the wash. If you like cheap bra's then just reshape them whilst they are wet.