if it is confirmed that urine is presant in the hallway spray it down heavily with an all fiber or acid rinse with a bit of a odor neuturalizer additive , give plenty of time to dwell. extract it with water only, then go back and do a light after spray with an enzyme based deoderizer rIght when you get done . I have used that method several times and always gotten good results. I think its your best bet since you cant replace the pad on glue down.