I do! I'm very obsessive..all my horsey stuff is organised and always clean! (except me when I'm at the yard!)
I do it once every 2weeks.
I soak my curry comb,and metal shredder blade thingy but before I clean them I use them to get all the hair out of the body brush Ect,I wipe over the tops of all the brushes and hoof pick, then I wipe over the hoof oil bottle and any other lotions and potions I have..Basically I use a lot of baby wipes
I dunk some brushes, but don't want to put my wooden backed ones in there..plus I always have baby wipes handy at the yard, so if I have time I'll give a quick wile over using them! will try outting some in the washing machine next time! (I only cleaned em' yesterday!)
At least twice in the summer (I only get to see them for seven weeks so it's not as bad as it seems). Once at the beginning to make sure they're sparkling and once during the summer when I have the time. Plus once at the end if I'm not in a rush (which I usually am with packing).
If you regularly brush a clipped horse over with warm water [lavender wash] this will clean as you go, use a sponge for eyes and one for dock etc, then throw all in to warm bucket of the wash after use, and that is them clean and horse clean all in one go.