Erm, if you dont want to buy anything, you could get a rag and some warm/hot water (not hot enough to burn the horses legs of course) and wipe his legs off, then kind of pick/scrape the remaining ones off with your fingers, or even a razor for your legs or whatever.
See, when you use the warm water, the eggs release. Because, when the horse licks the eggs, their warmish saliva gets on the bot eggs, and they release to go and be a pain in the butt in the horses body.
So, warm water and a rag will make them easier to brush/pick/razor/wash off/get them off in general.
A bot knife works better, but warm water does work also.