Girls, I'm not on topic, but I still ask. How do you get these stains …

Girls, I'm not on topic, but I still ask. How do you get these stains out of the sofa? We're renting an apartment, so the sofa isn't ours. Of course, I try not to stain it, there are sheets on top of the sofa. But they still appeared. I don't know if from water or urine. Photo below. I just wiped it with a damp cloth.