BTW, for beginners who don't know......

Monokote and Ultracote are made up of clear plastic with the undersurface composed of a layer of color/adhesive. The color/adhesive is the heat activated glue mixed with the color. Scrubbing the top of the clear layer won't affect anything other than the top of the clear layer. And that won't have much effect on anything other than the looks if you do it right.