No dull residue. Just mist for self cleaning action. Keeps your shower free of soap scum, mildew and hard water deposits. No scrubbing, no wiping, no rinsing, and no fumes. Safe on plastics and acrylics. Scrub Free Daily Shower Cleaner contains no harsh chemicals and is designed to work safety on most shower surfaces including fiberglass, plastic and acrylic. Safe for septic.