No matter how cold it is, this sludge is always semi liquid or liquid. It gets everywhere, on top of white snow, on people's footwear and leg-pants, being sludge-splashed all over the place as cars race through them, and on all sides of all vehicles, including buses, whose windows are often not visible! It even invades the indoors, where when you come inside and take your boots off, it drips into the drip pans that EVERYONE sets aside for your footwear to rest on, or if it is a store, it populates the first 30 or so square feet of the floorspace. Even after it dries off your footwear, it STILL stays there as a dry, powdery grey film that guiltily marks you in order to give you a constant reminder of its DOMINANCE.
Whenever I walk on the streets, I would imagine the grey snow as one big giant slime organism, laying dormant until it has covered the world with its essence, and rise up and devour all who dwell upon in some sticky purgatory. You can slice it with various sharp implements; separate it with tires and footwear; smear it into the ground like an unwanted pest; dry it with blasts of dry frozen air; or sunder it with the intensity of the sun; it remains, ever-present, will always come back together to reform and regroup, and keep going on its indomitable path towards complete and utter world dominance.
It is more of a threat from the fictional liquid Terminator T-1000 from the second science fiction titular movie. As you see, it doesn't use overt violence or guile like the T-1000; nor does it use social engineering to fool you into complacency, then strikes. No, no, no! Its quiet, unassuming in the most obvious ways, but it is there. It is there when you gaze upon it. It is there in your dreams. It is there to vex you as you contemplate the cleanliness of your vehicle. WORLD DOMINATION. No horror movie can capture the full magnificence of its intended emotion; nor properly be made a satire to comfort us in our hour of need.
Yes, my imagination runs wild here; and I do this to amuse myself and to play with the variety of wordplay.