He probably shouldn't have been startled that Optimus went to work on his frame instead of his own, but Cliffjumper nonetheless was. It was that slight discrepancy and lack of expectation, even if he knew what Escorts were for.

"Right... Ah, er." He did as asked, both hands flat on the wall, but then reflexively looked over his shoulders, optics wide in - somehow - brief, innocent surprise. "Wouldn't... er. Doin' anything in here be kinda... inconvenient?"

Not that he, er... mistrusted Optimus' skills as to be capable of making it pleasant, and the thought had the minibot quickly look back at the wall, shifting in place, but especially with their differences in height it must be... Inconvenient, at the least, to do anything in the washracks, right?