Great shot of the birds. We're having similar cold weather here. I thought that was bad until I checked the weather app to see that it was -8 in LaFarge WI where my friends live. Oh, yeah...memories of Minneapolis come flooding back. And let's not even think of those folks in Buffalo NY, the place I'd least like to live in the winter. :-)
@alophoto there should be screws holding the perches and bottom on so you just unscrew. I fill my laundry tub ( you could use a large bucket) with a little liquid soap and a little clorox and dump them in. You can use a bottle brush to help clean the tube. Rinse everything real good and screw it back together. Let dry completely and you're ready to go. Buy new is easier but the feeder looks fine to me.