Best time for showers are usually mornings, then afternoons. Evenings are the worse as most truckers are shutting down for the day. I usually shower in the morning so I rarely have to wait.
Ohio also provides shower facilities at their rest stops. You'll have to provide your own towel. The facilities are pretty well maintained, given that they're open to the public and provided at no cost.
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Across the nation, Flying J, in my opinion, has the nicest shower facilities. They provide brown towels.
Love's is hit or miss. I've gone to a few where they weren't clean. I think cashiers take turns cleaning and don't have a designated shower person like the other big guys. Towels are blue.
TA/Petro are also hit and miss. But they are usually efficient with getting the showers cleaned an ready for the next patron. Towels are orange.