I agree, but I think what it actually comes down to is this - I deliberately use the cleaner example because - I'm hiring a person to clean my tap. They might

I agree, but I think what it actually comes down to is this - I deliberately use the cleaner example because - I'm hiring a person to clean my tap. They might disagree with my reasoning for cleaning it. At the end of the day, I don't care what your opinion is on tap descaling, I want it done, so you either do it or I'll find someone who will. The management doesn't owe you a reason for preferring in-office work. It's not an unreasonable request, it's not illegal, they're not assaulting you or degrading you or something like that.