There is no single right answer, but there is a sensible rhythm. For most drivers in Arlington and Fairfax County, that means a light clean every few weeks and a deeper detail twice a year.
Parked outside
Street-parked cars collect sap, pollen and bird droppings all year. Plan on an Express Clean every two to three weeks and an Exterior Detail with fresh wax or sealant every four to six months.
Parked in a garage
Garage parking protects paint from sun and trees, so you can stretch things out. An Express Clean once a month and a full detail once or twice a year is plenty for most cars.
Kids and pets
Interiors with kids or dogs in them need more attention than the outside does. An Interior Deep Detail every four to six months keeps smells and stains from setting in.
The two best times of year
Late fall and early spring matter most here. In the fall, a coat of wax or sealant puts protection down before salt season. In spring, a full detail clears out winter salt and pollen.
The bottom line
If your paint feels rough after a wash, it needs clay. If water stops beading, it needs protection. If the cabin smells stale, it needs an interior clean. Your car usually tells you when it is time.