The service is the appointment you book when the outside of the car is not the problem. The cabin is: mats that have carried a winter of grit, seats that have carried a dog or a car seat, cup holders, door pockets, the film on the inside of the windscreen that only shows up when the sun is low.
On a Valetly booking, a vetted independent car valet comes to the address where the car is parked and works through the cabin: footwells and carpets, mats, seats and seat rails, boot, console, dashboard and plastics, door shuts and interior glass.
The Interior Valet is the dedicated cabin appointment at £119 and about 75 minutes. If the outside needs attention too, the Full Valet at £169 covers inside and out in one visit.
You do not need to be at home for the whole appointment, and you do not need to move the car. What you get at the end is a set of photos on the booking showing the state it was in and the state it was left in.