We've had some - ahem - 'difficult' tenants, and towards the end their kids went a bit feral. I know this because of the forensic evidence. Exbihit A was the phrase 'STAY OUT OF MY ROOM' carefully scratched into the period door of one of the bedrooms with a protractor, which we've had to sand down a bit. Exhibit B was the mysterious oily stuff splashed from child height up to the ceiling on all the walls, probably done in anger, which required specialist redecoration. Exhibit C is the same mysterious stuff (we think) splashed all over the frosted glass panels in the front door. And it's with the frosted glass where, Dear MNetters, I would welcome your advice and input, so I can hopefully avoid having to replace them at considerable cost.
I've had a go at it with alcohol wipes and then with washing up liquid and water, and professional cleaners have had a go at it, to no avail. It just looks like there are drips all over it. What to do?