That I have a shampoo or conditioner that is working well, in one week the effects are suddenly nowhere near what they were before? It just drives me crazy that I will use something new and be so happy, confident, and pleased with it, and then one week later I feel that it looks like crap.
Perhaps this is why I'm always so interested in finding new products, because I need something new to keep it good so often!
Years ago, when I was just out of college, I used to live in rented rooms. There was a girl who lived in the same house as me at one time, who was a research chemist. She used to bring home shampoo from work which she got for free in plain unmarked bottles.
She always had several different coloured shampoos, albeit all obviously made in the same place. Her explanation was that no shampoo will remove it's own residue, so unless you rotate them you get a gradual build up of residue. I dare say she knew what she was talking about, as she probably had something to do with formulating them.
Most likely silicone buildup, esp if its drugstore.... try a clarifying shampoo or vinigar rinse this should 'reset' you hair... at least for another week.
Sounds good, thanks guys. I will try using a good clarifyer, and also switching S's and C's more often.