For ice 2, if you look into the compound node, you'll see a colorramp and a noise texture. Those are what is causing the mottled look. To get rid of it completely, delete those and adjust the fac on the mix closure they were connected to so that the ice looks like how you want. If you don't mind a little mottle, adjust the colors so they are closer together. Darker colors make it more opaque, lighter more transparent.

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