Make sure Grout is firm to touch before washing
When grouting tile one of the biggest mistakes made by tilers is washing the grout too soon. When the grout is washed and wiped before it’s hardened a bit this can allow too much water to penetrate the surface. This can cause blotchy looking grout, hairline cracking as the grout does cure, or even grout that falls out because excess water does not allow the grout to cure properly.
To avoid these problems, make sure the grout is very firm before you start cleaning it – almost like a wine cork. Press your fingertip in to the grout to test it and if it dents easily then wait a little longer before wiping.
