Car AC Sanitisation is a very important part for all the cars, if your AC is not sanitized, it causes breathing problems and other allergy problems. Since your car air conditioning unit is always exposed to dust, dirt and moisture, it’s normal for bacteria to multiply inside it. However, you can do something to help get rid of the common causes of bacteria and microorganisms such as mould, mildew, and dirt. Best way to clean your car AC is first apply anti bacterial spray, clean the vents. Clean or change the air filters.