Here's what I do...
Polos - I think you can buy a mesh bag to put both polos and standing wraps in the wash so they won't get all tangled up but I can't seem to find one right now. So I would put them in that bag and then add some of this wrap and blanket wash
http://www.doversaddlery.com/eqyss-m...1-24437/cn/73/ . And trust me that stuff works really well.
Splint Boots - I would just throw them in the washer along with the detergent above. Just make sure they are machine washable. Also, if there's fleece on them you can throw them in the dryer for 5 or so minutes the make the fleece nice and fluffy again.
Standing Wraps - I would do the same thing as for the polos.
No Bows (I think that's what your were thinking of) - Just make sure they're machine washable and throw them in the washer with some of the detergent posted above.
Brushes - I've never heard of washing the in the washing machine before but I bet it could work. But what I do is soak my brushes in a bucket with some Palmolive until they're clean and then put them in the sun to dry.
Hope this helps.