Start with how your vehicles are used
A vehicle used daily and a backup unit may need different care. Consider trip frequency, operating environments and the condition between washes before choosing an interval.
Set your presentation standards
Your vehicles can represent your business at customers' locations. Explain the level of cleanliness you want to maintain. Cleaning before an event and routine maintenance do not serve exactly the same purpose.
Consider the seasons
The dirt on your vehicles and working conditions change throughout the year. Describe what you see. Washing options and winter needs should be assessed for each situation, without assuming an automatic schedule.
Distinguish between services
Exterior washing, interior cleaning and roof snow removal address different needs. A cab shared by several drivers may need attention even when the bodywork looks acceptable.
Review after the first visits
An initial frequency is a starting point to discuss. Observe the condition of your vehicles and how the service fits your operations. The schedule can be reviewed with the team under the agreed terms.