Digging that hole has made you tired, being tired has made you cranky.
you are the one digging the hole, idiot
Well, I just did an internet search about caring for, and cleaning marble.
Yes, tapes of all sorts can stain marble. Too include painters tape, and especially electrical or duct tape. Marble is porous. Once the adhesive in the tape makes it's way into the material, you're screwed. Only a professional can repair the damage. And, it ain't cheap. It often involves removing the piece from it's mount, and often requires the work be done in a shop facility.
Goo Gone and other acidic type cleaners cannot be used. The damage they would cause is worse then the substance being removed.
Generally, marble used on walls, excluding back splashes, is not sealed. It is simply polished.
Marble used on floors, counter tops, etc. are generally always sealed but, a spilled soda or other acidic beverages or food can still stain through the sealer. the longer it sits, the more damage done.
So, it sounds like the dirty lil' bastards did do significant damage to the marble alone. Particularly when you look at just how many ridiculous signs the disrespectful lil' bastards plastered all over the place. Not to mention the food and drink.
