I find the Indafa KeyPad cleaning works for the competitive price quite good, better and more practical as a brush or toothbrush. With the supplied cleaning agent can be removed well also hard Clinging dirt. Unfortunately this is only sufficient for 2-3 applications, with strong smearing. As a substitute I have, in a small empty pump bottle (glasses cleaning spray Lens Cleaner) a few drops SAGROTAN and 1-2 drops of dishwashing liquid filled and filled the rest with water. This works very well if keyboard clean with a sponge or goggles and screens clean with a cloth.