Interior detailing: what's really hiding in your car

A vacuum gets loose debris. It doesn't get the spill that soaked into the carpet pad, the grit packed into seat tracks, or the body oils on the steering wheel and door pulls. Those build up into the smell and grime people notice but can't pin down.

The haze on the inside of the windshield is mostly plastics off-gassing from the dashboard, plus whatever gets breathed and touched. It's why night glare feels worse in an older car, and it takes proper glass cleaning to remove.

Seats and carpets get shampooed and hot-water extracted, which pulls dirt out instead of pushing it deeper. Hard surfaces are cleaned with brushes into the seams and vents, leather is cleaned and conditioned, and glass is cleaned inside and out.

For kids, pets or work trucks, there's an add-on for heavier soil. It's priced up front, so there's no surprise at the end.

For most daily drivers, a full interior detail two to four times a year keeps things from getting past the point of no return. Families and pet owners usually go more often, which is where a membership starts to pay off.