My hair satiated on products, even back in my shampoo/conditioner only days. I used to have two or three combos running at all times and would change whenever my hair was limp. I never used hair products until I started lurking on nc.com.
I don't really think the products not working is because they cause build up with continued use. It has to do with your hair getting "bored" of them. (Don't know what the science would be.) I wet, use a rinse out and style every day, seldom let myself use any one product more then once in five days, if that. I feel that my low porosity hair doesn't always absorb all of the ingredients from some of the really rich products I use--I call that residual ingredients. So, I clean with soap bars every so often (7 days in the winter.)
3a (Corkicelli), highlighted, fine, low porosity
modified CG, since April '07
CG since 3/11/08
HGs: Anything Sevi; Curly Kinks Satin Roots, Curlycue ReNew and Coil Jam; homemade FSG and okra gel; soap bars; UFD Curly Magic; Botanical Spirits Jellies, CJ Repair Me