Can you use rubbing alcohol on a c section scar?

If the scar is completely healed I do not see a problem, but I don't think it will honestly help with it's appearance. As a general rule of thumb, ethanol should not be used of open sores/puncutres/cuts/scrapes and especially surgical incisions. It not only kills the bacteria, but also the regenerating cells; allowing the body to be more susceptible to infection and lengthening the healing process.