As a former long haired hippie freak type, back in my day I used the following regimen.
1. Wash daily.
2. Alternate shampoos. Never use the same one more than two consecutive days.
3. Use only salon shampoos. Get at least three different ones.
4. VO5 hot oil treatments about three times a year.
5. Use a detangler twice weekly. I recommend Paul Mitchell.
6. About twice a week, use the REAL horse mane and tail conditioner. Do NOT use the stuff from WalMart. Go to a tack shop or a co-op. Get the real stuff. It says to leave it in. Don't. Apply, wait at least ten minutes, then rinse out.
I'm serious.