Martha Stewart's go-to tool for repairing damaged grout is probably sitting in your kitchen drawer. Here's how she uses this ...

As well as grout removal, the tool comes with 16 interchangeable accessories ... or imperfect floors underneath. This will ...

I tried some other commercial cleaners and scrubbed as hard as I could, but I was left with the same rusty-looking grout every time. Then I remembered hearing about a nifty little tool called the ...