McKesson Isopropyl Rubbing Alcohol features a concentrated solution that can be used on hard surfaces. The 99% rubbing alcohol is useful for medical labs, science classes and schools, healthcare clinics, and other medical settings. The formula is non-corrosive so it won't harm metals or plastics and can be used on most surfaces. Mix a 50/50 solution of water and rubbing alcohol to use on hard-surface countertops, like granite and quartz. This is great for hospitals and clinics to use on small surfaces such as scissors, thermometers, and stethoscopes. 99% Isopropyl alcohol is not intended for use on the skin.