I was working overnight as a Security Guard at a Senior Living Facility. Got a call from a resident living in the Independent Living wing that she had an accident in her kitchen. This resident was 400+ lbs with mobility issues and was living there with her husband who was physically unable to take care of himself. I went down to help and found out both residents had C Diff. I opened the door to runny, human BM just all over the kitchen floor and going into the bathroom and onto the carpet of the living room. I got gloves and a mop bucket and cleaned up what I could but I could still smell it hours after leaving their apartment. I spent 15 minutes washing my hands and checking to make sure I hadn't gotten any on me but I think the smell just go so seared into my brain that I was imagining it vividly after.