How can we disinfect our cars in the most economical way?

Leaving the car exposed to the sun for 30 minutes with the windows wound up is an effective and economical method for disinfecting the vehicle. Sunlight contains ultraviolet (UV) rays, which have germicidal properties capable of killing many types of bacteria and viruses. By allowing the interior of the car to heat up under direct sunlight, the temperature inside can rise significantly, which can further enhance the effectiveness of the UV exposure in eliminating harmful pathogens.

This method does not involve any additional costs, such as those incurred from professional cleaning or car wash services. It's a practical solution for regular disinfection that can be easily implemented by any driver.

The other options may not provide the same level of efficacy. For instance, sending the car for an expensive car wash may be thorough, but it doesn't represent the most economical choice. Simply allowing the car to sit in a parking lot or keeping the windows down does not utilize the effectiveness of the sun’s heat and UV rays to disinfect efficiently.