I'd be surprised if the same people who clean the toilets also pick up the body parts. I would think that would be done by specialist clean up crews.
"Beryl, Beryl love, could you leave the bogs for now and go and pick up three dead lads off the tracks? Make sure you get all the skull...
cook pass partridge
On a serious note, it depends on the context. I like some of the stuff on buildings in Brighton. Seeing my 8 year old nephew burst into tears when some prick tagged all over my Brother's memorial bench on Plymouth Hoe, not so much. Context people, context.