Hello Bin,
If you have not done so already, it helps to drain the system at the lowest point. Meaning apply the shut off valve first, open the faucet at the lowest point (usually in the basement or ... read more
If you use a black light you can target the urine areas soak in white vinegar leave for ten min wet vacuum as much up as you can mix up a cup of water with a quarter size dawn dish detergant put in sp ... read more