A regular clean is maintenance. It keeps a home that's already in good shape looking that way: kitchens and bathrooms wiped and sanitized, surfaces dusted, floors vacuumed and mopped, trash out. It works best on a steady schedule.
A deep clean is a reset. It reaches the places regular visits skip: baseboards, door frames, inside the microwave and oven, cabinet fronts, vents, ceiling fans, and the soap scum and grime that build up over months.
If it's been more than a couple of months since your last professional clean, start with a deep clean. It brings everything back to a baseline that regular visits can then maintain without extra time or cost.
After that, most households settle into a regular clean every week or two, with a deep clean before the holidays, after a busy summer, or whenever the house needs a fresh start.