(4) Chemtronics CP400 Boxes of 50 Individually wrapped, presaturated lint-free isopropyl alcohol wipes. Chempad Presaturated Wipes are general purpose lint-free cleaning felt wipes that are super saturated with 91% isopropyl alcohol (IPA). They are excellent for general purpose cleaning of computers, office and laboratory equipment. These highly effective cleaning wipes are ideal for cleaning sensitive surfaces, fiber optic connectors, electronics components, touch keypads, keyboards, instrument housings, and magnetic tape heads. Chempad quickly and safely removes handling soils, dirt and oxides from PCB's, mechanical / electrical assemblies and other electronic equipment. Chempad is especially effective in removing ink and permanent marker.