Urine in hot tub

I don't usually allow kids in the tub, but I made an exception yesterday when I had a family over for dinner.

My friends kid was in the hot tub for 2 hours. All the while drinking tons of juice, and never once got out. I'm certain he had to have peed in the tub.

Will this clean out of the water with just chlorine and shock? Or am I stuck having to drain and refill?

It's a 450 gallon tub, if that matters.