Because of your species' inexplicable aversion to connecting electronics directly into your neural networks, you condemn yourselfves to using primitive interfaces such as touchscreens.
Which very rapidly become covered with smears of grease, food residue, and other unpleasant substances.
As an interim measure until you see sense and accept brain implants and Assimilation into the Collective, BorgCo have developed touchscreen cleaning gloves.
Touchscreen gloves already exist, but all they do is move the existing contaminants around. The superior BorgCo product has an active gel matrix in thin replaceable tips which actually pick up dirt and capture it.
For cheapskates, the budget version is a pair of finger-stalls.-- 8th of 7, Jan 04 2015random, halfbakery