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The Zep grout Cleaner & Brightener's professional-strength formula quickly restores stained grout lines on tile floors without the need for heavy scrubbing, restoring your dirty grout back to new. Deep cleaning grout is a tough job, even for pros, but the powerful Zep grout cleaner & brightener can lift deep stains with ease and little scrubbing. Zep Grout Cleaner & Brightener can be used on white or coloured grout lines, always patch test on inconspicuous area before applying to a larger area. Easy To Use simply apply the grout cleaner to the grout lines and leave to sit for 2-3 minutes. Scrub and agitate with a brush and wipe away the dirt with a sponge and rinse with clean water. Zep Pro Tip: Re-seal the grout after brightening to keep grout lines cleaner for longer. For the best results use Zep Grout Sealer available in 500ml spray.