Couple of posts back recommending it be winterized by a dealership is the worst advice I've seen for a while on this forum.
DIY if you want it done right.
The cheap -50 deg Walmart RV antifreeze is just fine and with a couple days of -19 deg F temps each winter over the year, I never saw any damage.
I personally hate the residual small and taste of RV antifreeze and have only blown out the lines with compressed air this season. I did run a bit of antifreeze in my rv water pump because I was afraid that residual water could freeze and damage it.
I may change my mind and later run RV antifreeze but for now its all air.
I was surprised by how little water was in the lines after I opened the low water drain points first. Surprsingly, I blew out the most water from the toilet water line.
MICE ARE A BIG PROBLEM IN COLORADO especially if you store your RV in a field.
Dryer sheets are a waste of time.
Sealing entry points is a great idea but the little buggers will always find a way into your RV and can do some incredible damage.
Mice got into our heating duct system via a heater exhaust tube. They urinated and nested in my heater's squirrel cage fan area, others found the ducts very comfy and built nice nests in them. Another group of mice decided that it was easier to nest in the insulation under the floor above the coroplast liner. The amount of feces and urine stained insulation was impressive! It took us several days to remove all of the insulation, disinfect the entire undercarriage and replace the insulation. Cleaning the entire heating system was another day's job.
I'm blessed that my DW helped me eradicate the mouse problem. She didn't even squirm every time she reached to remove insulation and pulled out mice droppings and even dead mice.
We placed lots of cab fresh pouches taped to the coroplast and inside our RV. We also have mouse traps in the camper too along with more cab fresh pouches. We prefer d-con circulator revolving traps that trap the mouse inside the trap instead of spring loaded traditional mice traps that are messy and touchy to set.
Outside we have 3 homemade bucket mouse traps.