PUT IN THE WORK!
"If you want to reach something, you got to put in the work"
No fast simplistic cleaning that's been called a 'deepclean'.
99% of detailers deepclean the interior with the seats in the car, that's like hiring a cleaning company that doesn't even move a chair.
My deepclean is truly a deepclean with no returning smells from wrongly drying the seats.
There's enough detailers out there who focus on polishing and applying coatings, but just a handful that does an excellent interior detail.