Okay, the
absolute cheapest - good diet and grooming and liquid ivory dish soap or liquid castile for baths and pantene conditioner for mane/tail. Only put enough ivory in the water to wet the water - more for castile. Rinse well. I used this for years and they sparkled until they rolled

- then my daughter won a "gift package" w cowboy magic shampoo in it...which is good, too. I really think it is more the packaging and "shopping" aspects that draw me to the cowboy magic, I don't think it is actually more effective.
Santa Fe highlighter and showsheen will make them shine.