I have in the past however they say you should not. I have gone to just getting a very gentle soap they use to make one for the SMB boots not sure if they still do. I have one of those large much type tubs I use warm water and a bit of soap and put them in and let them soak then scrub them then rinse. They come out nice and clean and in very good shape.
No matter how you wash them though do not put them in the dryer. Heat will really mess them up.