How can I remove product build-up w/o fading color

Hey there.  I have color-treated hair.  I had been using lots of silicone products for heat protection, but now my fine straight hair has build-up on it (even my stylist told me last week).  I used a clarifying shampoo and that really, really faded my color.  I'm due to color again anyway, so it's no biggie this time.  Anyway, it didn't seem to work that well.  It was Suave - maybe not a good brand?  I read in a magazine you can use 1 teaspoon baking soda in your dollop of shampoo.  That seemed to work better.