Whink® Lime Buster!®. Dissolves hard water problems fast! Great for removing soap scum buildup! Also dissolves rust stains. 16 fl oz (1 pt) 473 ml. Whink® Lime Buster!® quickly dissolves rust & hard water stains, soap scum and buildup on bathroom sinks, tile, shower doors, tubs and toilets. Also leaves fiberglass and chrome sparkling clean. Nonabrasive, professional strength formula is specially designed for hard water areas. Dissolves away unsightly buildup without scrubbing. Can also be used full strength to clean lime scale buildup in humidifiers, vaporizers, tea kettles and cookware. For toilets, stop rust with every flush with...... Rust Guard Whink® 2 in 1 Hard Water & Rust Toilet Bowl Cleaner . Safe for septic systems. Comments, Questions: Call Toll free: 1-800-247-5102 weekdays 9-4 CST. Visit: www.whink.com. © 2016 Whink Products Company.