The short answer is YES, using dishwashing soap is likely okay to use to wash your car. You’re going to get different answers depending on who you ask. Much of the information around this subject is due to the marketing indoctrination saying that you must use a dedicated car wash soap. Reasons given for doing so include: using a non-car soap will damage the car’s paint, a pH-neutral soap MUST be used otherwise it will also strip existing protectants, and dish soap will strip the car of its existing wax/sealant/coating. I don’t believe these claims to be true and I set out to test if a dishwashing soap is ok or not to use wash your car.