you could also try useing a ozone generator to kill the smell , you and any pets would need to get out of the RV for 1/2 day each time you run the ozone machine. They can be found on amazon, a large camper will need a 15,000mg output + unit. we do our RV every spring when we clean the carpets with a rug DR.
Mark & Melissa
2015 Redwood RL38 , Kodiak disk brakes , 17.5" tires , 8K Morryde IS , 2020 GMC 3500 DRW