btw alcohol tends to leave a film when it >evaporates. Contacts need to be wiped off after using it.
You are correct in that 'rubbing alcohol' (mainly isopropanol) can leave residues. People need to be aware that they need to check the list of ingredients on the container. Pure grades of isopropanol contain nothing but isopropanol (isopropyl alcohol) and usually a small amount of water. These do not leave residues. Generic rubbing alcohols can and often do contain additives along with water such as oils waxes and fragrances and these will leave residues.