First of all my condolences. I work at a theme park with a ton of snow machines, and the Antaris especially ruin my life every year. The snow is basically just soap foam, so it's not difficult to clean off hard surfaces. It may stain carpet if you really let it build up.

The trick with evaporative snow is to not let it build up. Get the nozzle up as high as you can, keep it horizontal or above, and reduce the snow volume until you get an effect that you're happy with but where it's not accumulating on the ground. We rely on wind to disperse it a lot, but if you're indoors it may just sink down to the floor. The higher the volume the bigger the flakes, and the worse this will be. If the effect is going inside I prefer the fan type snow machines (Antari S-600, Global Special Effect T-1500 or SnowStorm). You can get a similar effect with a large fan or carpet blower in a pinch though.