Hantavirus is a fatal respiratory disease that is transmitted by mice feces and urine. If the droppings are fresh, use an approved respiratory device and a Dupont Dyvek disposable coverall suit. Respiratory device that is approved has an N-100 filter or a current NBC military mask will also suffice.
During cleaning, wear nitrile rubber gloves.
Do not stir up dust by sweeping, high pressure spraying, or vacumming droppings, urine or nesting materials. This will generate potential infectious aerosols that can be breathed in more easily.
Thoroughly wet droppings with a bleach solution consisting of 1.5 cups of bleach per 1 gallon of water. I used a new chemical sprayer (used to kill weeds) that I bought from Walmart. I sprayed the solution into the uphill ductwork vent.
Once wetted, remove items by hand using lots of paper towels.
Ensure RV is parked on a hill so water drains down hill. The ends of ducts are not water proof.
Rinse ducts again with bleach solution and then rinse with water.
Rinse a third time with your favorite scent of odoban that freshens things up and smells better then bleach.
Remove heater from RV
Using sprayer carefully rince all contaminated areas with bleach and odoban. You may have to use a soaked towel to protect electronics and the motor.
Use chem sprayer to get soak the squirrel cage being careful not to get motor or electronics wet.
Let dry in open sun.
Spray gloves with bleach before removing
Discarded gloves and coveralls should be double bagged or burned.
I did this a couple of months ago to my camper. I ended up using a wet/dry vacuum that was vented outside and flooded the vents which then sucked up stuff that I couldn't get by hand.
Last step: monitor yourself for any respiratory issues in the next 45 days.
Odoban is available from Home Depot. I like every scent except the Eucalyptus one. It works great for pet odors too!