The present invention is directed to an acidic hard surface treatment composition which provides a cleaning and disinfecting benefit comprising: an acidic constituent which comprises water soluble organic acid; at least one anionic surfactant constituent; at least one nonionic surfactant constituent; at least one organic solvent constituent; optionally one or more further constituents and the balance, water. The compositions exhibit surprising efficacy against various gram positive and gram negative type pathogenic bacteria, as well as against fungi in the absence of known cationic quaternary ammonium compounds known to be effective against pathogenic bacteria, as well as other known-art antimicrobial constituents and bleach are excluded.