I know this sounds awful but as someone who competed on a 16 hand Anglo-Arab who was almost completely white ( thats a lot of horse to be completely white in a a show ring!

) for years I have a cheat secret! lol
It's corn starch...just dust the dirty spots...as long as ur horse is going to stay dry.
It doesn't clean them up but it will cover the marks that won't come off dirt scuffs, grass stains, manure smears after a good roll in the stall....just the little touch ups....for those hard to deal with stains...does wonders in a pinch for white stockings too....
I'm ashamed...but sometimes you gotta do what you gotta do in a pinch...
