Car wash is reconditioning the interior and exterior of the car. The aim is to keep the car clean and spotless, restore the paintwork by eliminating scratches or swirl marks, wax it to make it look almost brand new like it did when you first drove it out of the shop.
You should wash your car every two to three weeks for routine upkeep. People that park their cars outside could increase this to once a week, especially during rainy weather. It’s advisable to clean your car as soon as you see stains like bird poop, insects, or tree sap.