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Tile

How to Clean Grout Lines by Hand Without Damaging Them

The safest way to clean grout is to start gentle: scrub along the grout line with a small, stiff brush and warm soapy water, step up to a baking soda paste only where needed, then rinse and dry. Most dingy grout is surface dirt, soap residue, and body oil sitting in its porous texture. A narrow brush that follows the line gets more of it out than a sponge that skims over the top, and it does so without harsh chemicals.

Check what you are cleaning first

Before reaching for any cleaner, figure out the surface. Cement grout between ceramic or porcelain tile tolerates most mild cleaners. Natural stone such as marble, travertine, and limestone does not: vinegar, lemon, and many bathroom sprays etch it, leaving dull spots that will not wipe away. Epoxy grout is less porous and usually needs only soap and water. If you do not know what you have, assume stone and stay neutral. In a rental, test a hidden area first, such as behind the toilet or under the bath mat.

What you need

A narrow, stiff brush that fits the grout line. The Grout and Tile Edge Brush is shaped for grout lines and tile edges, and the Bathroom Detail Cleaning Kit adds tools for tap bases and fixture seams in the same room.
Warm water and a little dish soap.
Baking soda, for a paste.
A damp cloth for rinsing and a dry one for finishing. Cloths from the Microfiber Cleaning Cloth Set work for both.
Gloves and an open window or a running fan.

Step by step

Sweep or vacuum floor tile first, so you are not scrubbing grit into the lines.

Wet a small section, about two feet square, with warm soapy water. Let it sit for a few minutes so dried residue softens.

Scrub along the grout line, not across the tile, using short back-and-forth strokes and moderate pressure. Let the bristles do the work. Leaning harder mostly wears out the brush and can roughen the grout surface.

For stubborn lines, mix baking soda with a little water into a paste about as thick as toothpaste. Press it into the line, wait five to ten minutes, and scrub again.

Rinse with a clean damp cloth, wringing it out often, so the dirty water does not settle back into the grout. Then dry the area.

Move on to the next section. Working in small areas keeps cleaner from drying on the tile.

What to avoid

Never mix bleach with vinegar, ammonia, or other cleaners.
Do not use vinegar or acidic cleaners on natural stone, and avoid using them often on cement grout. Acids slowly break grout down.
Skip wire brushes and metal picks. They chip glazed tile edges and dig grout out of the joint.
Do not soak grout and walk away. Water that stays in porous grout is how mildew gets started again.
Steam cleaners and pressure tools can loosen old or weak grout. If you use one, test a small area first.

How to tell it worked, and when to stop

Grout is clean when the rinse cloth stops picking up gray and the line looks an even color along its length. Let it dry completely before you judge it, since wet grout always looks darker than it is.

Some marks are not dirt. Grout that is still dark after drying may be stained deep in the material, or its color may simply have worn unevenly. Black spots that come back within days in a shower usually point to moisture, so run the fan, squeegee the walls, and keep the door open after showers. Stop and call a tile professional, or your landlord, if grout is cracked, crumbling, or missing, or if tiles sound hollow or move when pressed. Scrubbing harder only widens the gaps, and water getting behind tile is a much bigger problem than how it looks.

Once grout is clean and fully dry, a penetrating grout sealer can make future cleaning easier. Follow the sealer label for drying and cure times, and never seal over grout that is still damp or dirty.

To keep it from coming back, a quick weekly pass along the shower floor lines and the lowest row of wall tile, where water sits longest, does more than an occasional deep scrub. Rinse the brush after each use and let it dry before you put it away.