I never knew anything about prepoos until I stumbled across this board. As long as I been going to the salon, which has been most of my life, my stylists never mentioned anything to me about prepoo (or conditioning washes) and my hair is navel length.
They always applied a simple regimen to my hair. Believe me, I have type 4 a/b hair, the most dryest and fragile--which my stylist reminds me of from time to time, and he's baffled that I have below the bra clasp or navel length hair.
From reading this board, I know some members put too much work into their hair; its not necessary and its overwhelming from my opinion. So don't follow the course that everyone else is.
Just do what's best for you. Use a moisturizing shampoo, and add oil to it if you have to. Then add oils to your conditioner. Get a good detangler, use a hair oil and add oils to your pomade or whatever you use. That's the key: oil. Keep those ends moist and wear protective styles (ends up and out of the air).
If you don't want to tweak your products, order these items from
www.hairoil.com. I endorse these products. Verifen Complex products save a lot of time, and they don't need "doctoring up;" in other words, you don't have to add any oil, honey, glycerin, shea butter, etc., or anything to them. Nor do you need to do a hot oil treatment, pre-shampoo treatment, conditioning wash, etc. Just use them straight from the bottle, jar, or canister. They're fabulous.