Thanks Bill for the great idea.
I'll definitely look into this--I aspire to mutate this into a spring scene after winter, so my only restraint with the artificial snow is that I need to be able to dispose of it without too much work.
I bought spray snow from Walmart that I'm going to test out on one of my steck roofs. It claims that it wipes off easily.
Which means one of two things:
1) It doesn't
2) It dissipates like water when it hits the plastic
You are so right about claims

! I would be a little scared to spray anything on Steck parts being so rare now

!
Sometimes the additives in spray cans will soften or discolor items. What do you think about cotton being pulled apart, & distributed on the roofs? I have used the loose hobby snow previously for a Christmas train display. It worked well. It looks, & acts like confetti. When I was finished with it, I used a shop vac with a new dust particle filter bag, & vacuumed it up, then opened the filter, & put the "recycled" snow in large zip loc bags until I used it again. Only 1 investment, I reused it for 3 Christmas seasons before not having the space to display the train

.