"I’m sorry this has happened to you, I make personalised items and I’d be happy to make you a set of 4 Harry Potter mugs to replace the broken ones," a good Samaritan commented.
They said they'd been left to clean up "the most horrific scene ever" and they've now had to close their Watford holiday home "until it is safe" again.
Furniture, used towels and rubbish were left strewn around the room, covered in the same mysterious brown substance.
The house was littered with food and drink too, as frozen chips had been thrown all over the floor and large sticky patches of Fanta were left on the walls and window sill.
Viewers can see a bare mattress which is covered in a large brown stain, a mucky bedsheet left crumpled on top.
