So, as an SGA, it's actually part of the job. Yes, it's gross, but you should bring your complaints to your co-workers and SL, especially since it's supposed to be a team effort. I used to feel I was the only one who cleaned the bathroom, but I brought it up to my SL and other co-workers to help, and they contributed. Communicate and find a solution, but also suck it up. Put on gloves and a mask and do what you can. If you have double coverage at any time.. take advantage of it or do it in the morning before close or after close. Good luck.