The Box Says NOT to Wash My Hair Before Coloring. Will My Styling Products Affect My Results?

Normal product use won't cause a problem. If you have a lot of buildup you should wash and completely dry your hair before coloring. They do not want you putting the color on wet hair as you dilute the product by doing so.

For the most part, one or two days worth of product can simply be brushed out before applying the color. But if you use many products, then reapply before washing for several days, you should go ahead and wash it. Just make sure it is dry before applying the color.