If you are unable to clean your grout discoloration or staining to your satisfaction, the next thing to do is re-grout your tile. Don’t panic! Re-grouting your tile is not as difficult as you may think, although it does require some work.
The first thing you have to do is remove all the old grout. While this can be done with a number of tools, the easiest way would be to head on down to Home Depot or the like, and pick up a grout saw like the one to the right. While you’re there you may as well pick up grout, a grout float, and a sponge or two. If you’re using sanded grout, get some rubber gloves as well.
Provided you own a bucket and a source of water, these will be all the items you need to re-grout your tile. All these items should run about $25. Please don’t decide you won’t need the $7 grout saw. You will cost yourself about 300-400 dollars worth of work and stress trying to do it with something else. The most expensive thing you’ll buy is the grout.
Now comes the most difficult part, you have to “saw” the old grout out of the tile. The small blade on the saw has a carbide edge. By placing the saw into the grout line and slowly sawing back and forth, the old grout will turn to powder and fall out of the grout line. Sound easy enough? It is. It is not a difficult thing to do, it’s just time consuming.
Start slowly! I cannot emphasize this enough. Until you get used to how much pressure to use and how to move the saw in such a way as to not chip the tile edge, you need to get a feel for it. While it’s fairly simple in the straight lines, between the two tile corners, you need to be careful of the corners. It is possible to chip the tile edges and corners when you do this. Mostly this is caused by not keeping the blade straight in the grout line, not keeping it parallel.
It should only take you a few minutes to get used to it. If you have sanded grout, such as in larger format tile or on a floor, there is sometimes an additional blade included that looks more like a saw, use that one. You can use either for any type of grout, just use the one that works better for you.
You will need to remove as much of the old grout as you can. Ideally all of it should be removed but you must remove at least 2/3 of it. This is to ensure that the new grout has enough of the tile edge on which to adhere. Take your time, this is the thing that will take the most time. When you’re all done, just vacuum up the grout dust. Take a break and have yourself an adult beverage a Coke.