How to get the pee smell out?

The vinegar has to be white vinegar or it won't work.

Why don't you just throw it in the wash machine with some laundry detergent?

I was going to say nature's miracle.. but everyone beat me to it ;) haha it's amazing stuff, my dog has peed on my bed (yeah, ew.. he was a pup) and you can't see or smell it!

I'm sold on Odo Ban which is sold at Sam's Club. It is an odor remover AND a germ killer.

I use it in the barn and in the house. If you have really stinky jeans - like you've been riding bareback, put a little Odo Ban in the washer with the clothes.

Use a 50/50 Water Vinegar Solution, it is my FOR EVERYTHING cleaning tool.
It works amazing and you will be greatful ;)
:)
Just if you want to have the vinegar smell out after just scrub it with something that smells good like dish soap, it shouldnt bring back the pee smell

how come nobody has mentioned that turning out horses with a lead on is a no no?

With a lot of people, it's not a 'no-no', but has been used as a training tool for years. I know a lot of people who turn their horses out with a lead on... if they step on it, the learn to calmly step back or to the side and they learn to not panic. It can really help teach a horse to stay calm when their head is 'caught'. As long as the lead is kept on in a safe enviroment, or as long as they're kept a close eye on, it's fine.