Clean the interior
Your car should not look clean only on the outside. Keeping its interior clean is more important. You are sitting in it and spending time in it. It should be clean. Bacteria thrive in an unhygienic environment.
A great way to clean your car is to use coffee filters instead of fancy cleaning cloths. You will be amazed at how efficient these simple coffee filters are. They’re also much cheaper from special dashboard cleaning cloths you may find at stores.