Mr Mop, and Mrs Bucket - construct and mimic pair. (Patreon)

Good afternoon Mr Mortis, we are very sorry to hear about the damage caused to your family's dungeon... however as you have the correct coverage we are able to assist in its recovery and restoration. I promise you, dungeon cleaning Inc will make it just as it was before it was raided by those so-called "heroes"

We understand many of your rooms are totally trashed due to the overuse of the fireballs spell. This means we will need to clear the debris first before we can begin repairs. To that end, I would like to introduce: 

Mr Mop and Mrs Bucket. Don't be discouraged by their simple appearance. They work great as a team. We close them inside the room and within mere moments the room is totally clear!!!

DM note—I can already smell the paranoia of your players.