Public bathroom

So I'm sure this has been asked but I'm going to be living in a dorm this fall and it has bathroom stalls not more private bathrooms. How do I clean the cup when I can't get to the sink. It's only 2 stalls that I will be sharing with 3 other girls and I'm not positive but their could be a cupboard above the toilet in each stall I could keep wipes and stuff but do wipes really work good to clean it. Or I saw the diva cup shakers that you put water in beforehand and then put the cup in and shake it? I'm not too worried about carrying stuff into the stall but I really don't want to leave the stall with a used cup to go to the sink 🤣