The fifth panel, oh, god, the fifth panel. I agonized over this more then I should, because, well, do Cybertronians take showers? I know they likely wax, but do they shower?
Bounty hunting is a dirty business, surely these guys will get dirt, other bots' blood, shit, or other nasty stuff all over them. I figured then, they would at least wash and wax off. Prowl probably primps more then the Lockdown and Wreck-Gar though. ^^