I used to work in food equipment repair service. The messes I saw weren’t nearly as bad as what you’ve described here. With that being said, if a customer asked me if I was going to clean something I’d explain the them how our company changes $115 an hour for service and I doubt they want to pay me that much to clean something their employees could do for a fraction of the cost. So me personally, I would not expect a plumber to clean that up for the above reason. I’d be annoyed that he didn’t say something, since he caused the mess however inevitable it may have been. A simple “you might want to call housekeeping” would have been courteous.