Remove hardened grout from your tile with sugar. Stir white sugar in warm water in a ratio of 1 part sugar to 10 parts warm water. Sponge this mixture into the hardened grout. Leave it alone for an hour, then scrape the grout off your tile.
Clean your tiles afterward since the sugar water can leave behind a sticky residue. Sugar water is slightly corrosive, so it breaks down the grout to make it easier to scrape out.
It may sound strange but using a solution of white sugar dissolved in water can help to soften grout for removal. This is not to be confused with Sugar Soap, which is a different substance. Add some normal white sugar to some warm water and stir it in at the ratio of approximately 1 part sugar to 10 parts water.
Unsealed Grout
The vinegar penetrates into the pores of the grout, further weakening the material. Over time, vinegar will deteriorate the condition of the grout by etching or wearing it away. If, however, you have sealed your grout on a regular basis, the vinegar won't be an issue.
GROUT AWAY – Tilers Grout Dissolver.
The Grout Away solution can be applied directly to grout blockages such as in floor wastes, shower wastes, basin and bath drainage pipes, sewer traps, gully's, DT's and other common area's.
Baking soda is mildly abrasive so it helps remove the dirt that is stuck in the porous grout surfaces without causing any damage.
An angle grinder is a powerful tool best suited to large grout removal projects with a lot of long, straight lines. They can easily cut through epoxy, sanded, or unsanded grout.
Highly caustic or acidic cleaners, like bleach or vinegar, will corrode and slowly destroy grout and tile finishes.
Little did you know that cola is great for cleaning tile grout! If you have dirty, dingy grout, pour a bit of cola onto the area, let it sit for a few minutes, and wipe clean. For tough stains, use a cleaning toothbrush to scrub the grout before wiping the area clean. Cola Cola can also be used on carpet stains.
Baking soda and dishwashing liquid
Allow to sit for 5 minutes, then scrub away with a grout brush. Wipe away the dirt with a sponge. You could also use our soft scrub cleaner which contains similar ingredients and has amazing results!
So, how do you clean grout with vinegar and baking soda? Apparently, vinegar is a popular natural household cleaner, but it's too acidic for cleaning grout. In fact, the acetic acid in vinegar can corrode the grout over time, so you might want to avoid using it for cleaning in this case.
Method 3: Boiling Water
It's as easy as it sounds: pour boiling water all over the grout and let it sit for a little while to knock out the stains, cleaning it pretty quickly after applying. To be fair, I let it sit on the tile the same amount of time that I let the others sit.
ANSWER. ANSWER - It is possible to grout over existing grout if there is enough depth to do so. 1/8 inch depth may or may not be adequate depending on the type of grout used. A latex modified grout may work, but you have to properly clean the existing grout to ensure the new grout adequately bonds.
Unfortunately, vinegar penetrates unsealed grout by seeping into the air spaces within the material. Once lodged in these spaces, vinegar will corrode grout with the passage of time. The grout will eventually wear off. So you should take not to apply vinegar for cleaning purposes if you have unsealed grout in the area.