I have an on-going issue dezoning landfill. I cut off all access and slowly, it does indeed decompose so I can dezone. However, the last 2 x 2 tiles (in fact, the very origin of where the zone began) never seems to decompose. The rubbish is clearly not going to it, as access is cut off, so I'm at a loss as to why it won't go, even after decades in simcity years. I've even tried to run diasters over it to see if that will destroy it but to no avail. Most annoying of all, although these landfills were situated away from downtown at the start of the city, the development eventually caught up to it and it is now taking up prime real estate, with no sight of going any time soon!
Any help is much appreciated. Oh, and I'm referring to Sim City with Rush Hour expansion.