Personally wouldn't recommend using hand sanitizer. IPA of various concentrations is already cheap and readily available in every pharmacy section, or a can of WD-40 Specialist Contact Cleaner is also around $5. In theory, hand sanitizer would "work" if it's ethanol/isopropyl alcohol based, but there's such a broad range of hand sanitizers, it would be irresponsible to make a blanket statement that they're all safe/unsafe for electronics. For example, many brands include fragrances, moisturizers, vitamin-E, etc. to keep your hands from excessively drying out, which can end up leaving residue and gumming up your electronics' contacts further.