This is very subjective to your personal use and preference of your vehicle. The general consensus is at least once a year, but ideally twice a year. When you detail your car, not only is it deep-cleaned, but it’s also sanitized which does not usually get done with a regular wash. When detailing your vehicle don’t forget long-term paint protection as well. This is the most overlooked detail service, and here in Arizona it’s especially important to protect your paint from the heat and UV index to prevent oxidation.