Well I’ve read on here that urine which has sat for awhile and smells like ammonia can fixed by leaving the cap off for a day or two.
Well I’m pretty sure that’s fake news. I go one bottle of F&T Bobcat and one bottle of Fox urine from Johnny Thorpe. Both have sat for almost a week with the cap off and I cannot smell a difference. Still smells like ammonia.

That ammonia odor will dissipate once applied to the open air of a set. I have never seen any evidence that it compromises a catch .

I maybe wrong but I think the ammonia gives urine its calling ability! Maybe asa can set me straight on this.All urine produces ammonia

Like Asa said, there is nothing to worry about with that smell, so use it.
When it smells like sewage, THEN, there is a problem.

I did use some of the bobcat urine earlier in the season and it attracted a lot of deer attention.

Due to the salt content of all urine it is an attraction to deer.