Well, I would just replace the strap, but if you want to keep it, you can try step 3 of 3 on this site. It is rumored to work with pet stains as well.
http://www.wikihow.com/Remove-Urine-Stains-from-Mattress
I just used it (today) and it took out the stains, and did neutralize the odor.
Good Luck!
http://www.wikihow.com/Remove-Urine-Stains-from-Mattress
I just used it (today) and it took out the stains, and did neutralize the odor.
Good Luck!
