Theodore laughed, but he was a bit embarrassed, too. Draco had certainly expressed his displeasure with what Theodore had been doing, but Theodore hadn't realized that he'd complained to anyone about it.
"It wasn't really worth complaining about in terms of being dirty," he said, amused. "Not even before I started."
But he found cleaning spells calming, for some reason. It was what he did in the hospital wing whenever there was nothing else to do, and Rosier had never complained. "Don't you have a servant?" he asked curiously. "I don't mind cleaning, of course, but I'd rather just hang out with you."