Extra Power for Quick Clean-Up Jobs – Time-Lapse Action For Tough Stains – Institutional Mr. Muscle®* is formulated for quick cleaning when results are needed fast. In addition, for tougher jobs, Mr. Muscle has a special time-lapse action which continues to work when the foam is left on for a period of time. Institutional Formula – Heavy-duty cleaning power for fast and easy cleaning. Self-Scouring Action – With unsurpassed clinging ability, Mr. Muscle starts breaking down tough, baked-on grease and grime on contact, even on cold surfaces.