Unlike the ceramic tiles it separates, grout by itself is quite porous. It easily absorbs any water and oil-based solutions that land on it. The moisture, in turn, promotes growth of mold and mildew on any organic material present.
When the grout is completely dry, consider applying a masonry sealer with a fine paintbrush. Follow label instructions. Sealer is available at home centers and hardware stores. The grout won’t absorb as much moisture and grime once all the tiny pores have been sealed, making future cleanings easier.
Reference:
Don Aslett in The Cleaning Encyclopedia: Your A to Z Illustrated Guide to Cleaning Like the Pros.
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