Muck: v. to clean up; especially to clear of manure or filth ...Merriam-Webster online search
Although there's a difference between ice crystals and manure, the process of slinging debris is the same: Scoop it up, and flick it aside. In these photos, Claire shows how it's done.
First, scoop out dislodged ice using a dip net.
Then drain water from the ice and give it a toss!
Alternatively, you can fling the ice into the air and pull away the dip net. Mucking gives your forearms and shoulders a good workout...