A regular cleaning holds the line. A deep cleaning moves it. The difference is not effort or time, it is the list: a regular visit handles what you see and touch every day, while a deep clean handles the places that only need attention two or three times a year but look terrible when they are skipped for five.
The deep-clean list is fairly consistent from house to house. Baseboards and door frames, which collect a grey film nobody notices until one of them is wiped. Window tracks and sliding door channels, which in Tucson fill with grit. Switch plates and door handles. The tops of doors, fans, and cabinets. Behind and underneath anything that moves. Appliance exteriors, including the sides of the refrigerator and the gap it slides into. Tile grout and the hard-water line around fixtures. Inside the oven and refrigerator if you want them, which are always priced as their own item.
The clearest sign a deep clean is due is that regular cleaning has stopped making the place feel clean. If the floors are mopped and the counters are clear and the room still reads as tired, the problem is in the layer underneath — the film on the baseboards, the haze on the glass, the grout that has gone a shade darker than it started.
The practical order is a deep clean first, then a regular schedule that keeps it up. Starting the other way around costs more over a year, because every regular visit spends its time fighting a backlog instead of maintaining a finished space. Most households land on a deep clean once or twice a year, with weekly or biweekly visits in between.