You can't "just wash" a cast.

They have washable cast now a days. OP Im sorry your dog pissed on it. Ask for a washable one next time.

That's what I am doing lol so far it seems to get rid of some of the smell

2 tablespoons of bleach in a gallon of water. Put it in a spray bottle and spray until just damp. Let set for 5 min then take damp cloth and rinse. Should clean it nicely

:)

Before anyone asks I'm a professional carpet cleaner, and I think it'd be ok to do that for a cast.

Woah interesting definitely going to try that!

There's some stuff that I think 3M makes, its an odor neutralizer that works super well (albeit you'll smell like recently cleaned restroom) but its non bleaching and comes in a small bottle. Try it out if you want, it might be all of 10 bucks online

baking soda does do the job. my cat had pissed all over my brother's bed and we just dumped a shit ton of baking soda. it eliminated the odor quickly and soaked up the urine.

Because dogs know what dry cleaners and Christmas are don't they? Not to mention the fact that that is just plain mean.

On the contrary, dogs pee on things they class as theirs. So perhaps it's the other way around.