2 remove damaged grout and debris with a grout saw.
How to fix ceramic tile grout.
If the space is larger than 1 8 of an inch use a sanded grout.
Wipe this mixture over the tile with a.
Then dip a clean toothbrush in the mixture and scrub the damaged grout until all the dirt and grime comes off.
Wet an old rag and clean the surface of the tile for more grout smudges.
When a hazy layer appears on the tiles you can buff them clean using a dry rag or microfiber cloth.
That way you can see the exact color of the grout and buy new grout that matches it.
Clean the surface of the surrounding tiles completely with a soft cloth.
If the cloth doesn t remove the haze mix 1 part white vinegar with 1 part water.
Match the caulk at most tile specialty shops you can get or order sanded caulk most floor grouts are sanded that will closely match your existing grout color.
This fix is only practical for interior tile floors and when the gaps between the tiles are 1 4 in.
Once it s semi dry wipe your tiles using a sponge dampened with tap water.
If the width is 1 8 of an inch or smaller use an unsanded grout.
Choose the correct type of grout based on the width of your tile joints and where the repair is being done.
Gently run the grout saw back and forth along the grout seams.
Be careful to avoid damaging the tiles.
Never use sanded grout with metal glass or marble tiles.
Scrape any excess grout from the tiles using the edge of the grout float.
The color of the grout will initially look a shade darker than the old grout.
Give the new grout about five minutes to sit.
Measure the space between the tiles.
Clean the damaged grout with white vinegar and water.
Use a spray bottle and some cold water to wet the areas where you removed the grout.
Step 3 clean the seams.
Use a grout saw to remove the loose or damaged grout in between the tiles.
Step 2 remove loose and damaged grout.
1 clean the area where the grout is broken with a 1 to 1 vinegar and water mixture.
Mix one part white vinegar and one part water in a bowl or bucket.