My horse just wears an old leather halter as his everyday halter. I clean it every once in awhile although not very often. If we go anywhere off property he wears his show halter (leather halter is super condition with his nameplate). I personally don't like the look of nylon halters. If I used a nylon halter I'd probably get a dark coloured one because I'm guessing light coloured ones would get dirty alot faster.
The essential joy of being with horses is that it brings us in contact with the rare elements of grace, beauty, spirit, and fire. ~Sharon Ralls Lemon