Well I use the same washing machine, but I don't actually put numnahs and tail bandages etc in with our clothes - I do them on a separate wash and then afterwards I put the machine on a rinse to get rid of the hair.
I don't wash it all together, I don't really want horse hair stuck in my clothes anymore than I have to. Like boxers, I do a wash then run the machine on a rinse wash.
I wash my horsey clothes (jods and stuff) with my normal clothes but not horsey attire like boots, bandages, numnahs etc. I don't want horse hair all over my work clothes!
And heaven forbid that I put any of my OH's clothes in with my horsey clothes...I wouldn't last long!!!
I clogged up and broke our last machine with hair, have to wash 12 very hairy ponies numnahs and girths about twice a week.
I've now splashed out on one of those wash bags, it fits 4 or 5 numnahs and saves lots of arguments with OH.