No, a car wash would not do a better job than a shower!! Car washes recycle cycle their water and they do not sanitize it. Do you want to wash your venison off with water that has road salt and road crud in it? A bit of blood going down the drain is no worse that the crud and bacteria from your body going down the drain. Actually, unless the person who rented the motel or hotel room destroy or trash it there is no problem with washing game in the shower. Just in case you don't know, a bathtub is the favorite place for poachers to butcher their jack lighted deer! Lets not try to impose your sensitivities on others.