There's no single right answer, but there is a realistic one based on how North Texas heat, pollen, and driving patterns actually affect a vehicle over a year.

"How often should I detail my car?" doesn't have one universal answer — it depends on how the car is used, where it's parked, and which season it is. Here's a realistic, season-aware answer for North Texas specifically, rather than a generic rule pulled from a milder climate.
These are two different maintenance cycles that get conflated. Washing is frequent and light — removing surface dirt before it has a chance to sit. Full detailing is periodic and thorough — addressing paint condition, deep interior cleaning, and protection. Most vehicles need both, on different schedules.
For most North Texas daily drivers, a wash every one to two weeks keeps dirt from accumulating into something that requires more aggressive cleaning later. Vehicles that are garage-kept and driven less can often stretch that interval; heavy commuters and vehicles parked outdoors should lean toward the more frequent end.
A full interior and exterior detail every three to four months is a reasonable baseline for a daily-driven vehicle in North Texas — enough to address seasonal buildup before it compounds, without over-servicing a car that doesn't need it. Lightly used, garage-kept vehicles can often go somewhat longer between full details.
North Texas doesn't have a mild season for vehicle maintenance — pollen, heat, and storms each create their own reason to stay on top of it.
If you're not sure where your vehicle currently stands, a straightforward way to find out is getting an honest assessment rather than guessing from a generic schedule — condition varies enough car to car that a real look tells you more than a calendar does.

No — garage-kept vehicles generally accumulate contamination and UV exposure more slowly, so they can often go longer between full details than a comparable vehicle parked outdoors full-time.
Not typically for washing, but excessive machine polishing beyond what's needed removes clear coat material unnecessarily — full details every 3–4 months is a reasonable ceiling for most daily drivers.

What actually helps against Dallas heat and UV — and what's just marketing.

Why North Texas pollen season is a real threat to car paint, not just an annoyance — and what actually helps get through it.