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There are several ways to stay clean in the van.
In-vehicle showers can be both power-, space- and water-intensive, putting them out of reach for most van dwellers. Class C and larger vehicles have the space and water tank capacity to make regular showers a reality.
Folks in vans do have some shower options, although expectations may need to be adjusted.
The easiest way to get long, hot showers is to have a gym membership. The most common amoung 'dwellers is the Planet Fitness “black card” membership, since it allows use of any PF nationwide.