There is so much wrong with this on so many levels. The Wall Street Journal article said that the maintenance crew at Disney can't stand it when they find people doing that. Turns out everybody's on camera at all times. They will be caught and it will be cleaned up. If your caught your permanently banned from the park.
On a side note at Wrigley Field in Chicago, Cub fans have been dumping ashes on the field since the 1920s. It may be the biggest cemetery in town. And then a couple years ago Wrigley Field got a complete remodel, and all those ashes wound up in a landfill someplace.