There's no rule that says interior comes before exterior or vice versa. Book what needs attention first based on what you see, smell, and touch.
Book interior first if…
You have stains, spills, or embedded pet hair.
The car smells stale, damp, or of smoke.
Salt stains are white-ringed on mats or carpet.
Kids or dogs ride daily and it shows.
Book exterior first if…
Paint looks dull or has water spots.
Bug or tar residue is visible.
You've just come off a road trip.
You're prepping for photos or a listing.
When Complete Detail wins
If both interior and exterior need attention, the Complete Detail ($349) bundles both for less than booking them separately ($229 + $119 = $348 without the extras). And you only lose one afternoon instead of two.