I brought an old iMac back home from work, it would be thrown out or disassembled/destroyed.
It's a last gen tray loader blueberry iMac, 333 Mhz with 265 MB of RAM (upgraded) and the stock HDD
Anyway some yobbo attacked it with a spray can and after some rubbing with iso alcohol, I managed to make the the biggest stripe on top of the iMac disappear.
Still have the sides and one speaker grille to do but I'm fairly confident I could get all those marks gone.
On a side note, a couple of hours after I brought it home I realised that I have the very same iMac that Peggy Hill has in King of the Hill.
As I'm a fan of the show, I think I might restore this thing to its former glory and upgrade the hardware, set a nice KOTH related wallpaper and use/show it whenever a conversation lands on the show haha.