The old grout might be moldy and beyond cleanable.
How to get grout out of ceramic tile.
A good grout haze removal technique is to use rubber gloves and a mask while working in small areas across the floor wall counter or backsplash.
If you have installed ceramic tiles in your kitchen or bathroom you should probably know that removing the hardened grout is maybe more difficult than the actual installation.
Excess grout can mess up a ceramic tile job.
To avoid excess grout use a release agent on the ceramic tile.
When you start to clean up excess grout start in an out of the way place and do a small 2 foot by 2 foot test area.
The best way to clean a ceramic tile floor is to take care of the grout while you wash the tiles.
Applying grout can be messy and leftover grout on the surface of the tile or baseboards can make a tiling job look unprofessional.
When grouting tiles you should always clean them thoroughly as after the grout dries out it will be a lot harden to remove it off the tiles surface.
Rinse the tile with clean water and dry the surface with a towel.
The rubber grout float.
There are a few good reasons why you might want or need to remove old tile grout.
Scrub the tile with the nylon scouring pad.
Wet grout is easy to wipe away with a damp sponge but because it is comprised mainly of cement it can be very difficult to fully remove dried grout from porcelain tile.
If there is still a film of grout on the surface of the tile apply more water and continue scrubbing with the nylon pad until you are satisfied with the result.
Standard grout comes in a variety of colors.
If the haze lingers a clean terry cloth towel can get through the haze when paired with the right cleaner.
Pick one that complements the color of your tiles.
Tile grout can get stained with leftover soap scum and dirt that is left behind while mopping your floors.
To actually remove the grout scouring pads and water work best.
Armed with this handy tool you can remove 15 square feet of grout on 4 by 4 inch tile in about one hour.
These grout stains make your tile flooring appear dirty even when it is clean especially with a bright white grout.
Homeowners who installed grout themselves can reach into their toolbag once more.
If the damp cloth fails to lift the grout haze break out the rubber grout float.
Only make as much as you can use before it begins to set.
Cheesecloth dabbed with commercial removers can get the haze off quickly and easily.
Mix thoroughly to help minimize color variation.
I ve tried scraping the dried.