Comment by ivanhoe

On one project for automotive industry we had a huge problem with touchscreen interface because mechanics often have grease and dirt on their hands and the touch screens we used would get all confused with the residue left on the screen. We first tried to fix it in the software, but quickly realized it's much easier to switch to custom control board with specialized buttons and keyboard, just wrap them in plastic bags so you don't have to clean them, and it all works like a charm. Unexpectedly, it turned out to be faster for users too.