What is the ruling on the salary received by a worker who washes dishes and arranges hotel rooms, given the presence of dishes containing alcohol that are washed by him?

It is permissible to work in cleaning hotel rooms as long as the core activity of the hotel is permissible, even if it offers prohibited things, provided that one refrains from washing alcohol containers and other tools used for committing prohibited acts. It is forbidden to wash alcohol containers because it constitutes aiding in sin, and if you do so, the portion of your salary corresponding to this forbidden work becomes unlawful for you.