 And you may need to do that with a grout knife or you can grind it out. But you've got to get the grout out of there. You're going to need to replace that. And then you'll use mastic, a thick tile mastic, to reset that tile. And then once it's dry, then you can re-grout it. Now, the grouting part is probably the trickiest because, you know, you're going to have old grout near new grout. And one way that you could deal with that is you could decide to re-grout