If this treatment is not enough, I would try ozone treatment for each area or room using a good powerful ozone generator, something like this: https://www.amazon.com/Enerzen-Commercial-Industrial-Deodorizer-Sterilizer/dp/B00JAP7388/ref=sr_1_1?crid=16UI9CMYB21XR&dib=eyJ2IjoiMSJ9.bqZi06gpP4Wc6uNM3sTt9Z4S54vabfbOvmEc50NbeME_XZxqV6OX2npl4LBbAbV9bo68T7vTDjux6oNHYICl4cuI3HYCpw1IwYoMeEyMluLb-icoSbAkbXdLl9-pR3sxU51TttPsPpJfnSZrv3HalxQwisEotIjGQT6u87L1u4ZcWTcOTeAIwtTe0vh5Hj6lKF15RbSIc8ZIbh3R14_PAPsYo4wxDYTKXU8Cu9wE0W8.lYBlzUqsBSlSLqyPFEJl84JMsndXLV0w1KKDc4HmztA&dib_tag=se&keywords=ozone+generator&qid=1710015634&sprefix=ozone%2Caps%2C138&sr=8-1
Disclaimer: I have no experience or any association with the above mentioned products. Follow manufacturer's instructions and take all safety precautions.