https://turbotax.intuit.com/tax-tips/self-employment-taxes/what-you-need-to-know-about-truck-driver-...

"You can also deduct expenses for showering or doing laundry while traveling for business. Keep track of these expenses, as they can really add up."

I point out that toiletries, having your hair or nails done, etc, is personal.

If you were traveling for business, staying in hotel/motels, you must report actuals. That shower in your room is part of the room charge.