Two things brought to my attention in a recent Nursing Times:
1. Lactococcus lactis, a bacterium used in cheese making, produces a substance that is effective against C. diff. Read the paper in Journal of Medical Microbiology (doi: 10.1099/jmm.0.47085-0)
2. Dry steam cleaning can be effective against HAIs, according to a report in Chemistry and Industry, which I have not yet traced.