I don't think it's rude especiialy given the fact there are 650 rooms in the hotel. Just put them on top of the dryer. I know when I have used hotel laundries, and I don't get there in time, I feel bad that I didn't make it, but am glad that someone went ahead and took my stuff out so that they could use it. I wouldn't want to hold someone else up... but that's just me.