It should smell like nothing at all.

Steam does what spray cannot

Most interior 'cleaning' is a wipe with a dressing on it: it moves the soil around and leaves a shine that attracts more of it. Steam lifts what is bonded to the surface, gets into grain and seams a cloth slides over, and does it without saturating panels or leaving residue behind for dust to stick to.

In this part of the country the soil is mostly fine caliche dust, and fine dust is exactly what packs into textured plastic, seat stitching and the base of the shifter where a towel never reaches. That is the difference you feel on a steamed interior.

Leather, properly

Leather gets decontaminated by hand before anything is put back into it. Conditioning dirty leather seals the dirt into the grain and leaves you with a slick surface over a dark, worn looking seat, which is why so many 'conditioned' interiors look worse a year later.

Clean first, condition second, and the UV load matters here too: a dash and a set of seats parked outside in Odessa take sun that cracks and fades them years earlier than the same vehicle in a garage. An SiO₂ dash and panel protectant is the cheap insurance against that.

The places a wash never gets to

Headliner, vents, door seals, the channels under the seats, the seams where the carpet meets the sill. Individually none of them is the reason a vehicle feels dirty; together they are the entire reason. Carpet and upholstery get shampooed and extracted, hard surfaces get steamed, and a sanitizer top coat goes down at the end.

Then put your nose in it. A finished interior does not smell like an air freshener, it smells like nothing, because the thing that was making the smell is gone rather than covered up.

Work trucks are the honest test

A lease with 12,000 miles is easy. A crew cab that has hauled tools, dogs, kids and lunch across the Basin for four years is where the standard actually shows. Same routine, more hours, and we will tell you up front what will come out and what has gone too far: a burn, a bleach mark or a stain that has been heat set through a summer is not something a shampoo undoes, and you deserve to hear that before you pay for it.