Gains From Trade, Metropolitan Edition

Here's a serious question:  why don't more cities rent out their snow services?  Upstate New York is apparently blissfully free of snow, and short of money.  Washington DC is one of the flushest metro areas in the country, and in need of snow removal.  Why not get some of the snow removal equipment--and talent--from Rochester and Syracuse and Buffalo on the road?  They could be here in twelve hours at the outside, and have this place cleaned up in a jiffy.

It seems like this would be a win-win combination.  But as far as I know, no one's even suggested it.