Changing colour of existing grout

[Arron]

We’ve recently had some tiles laid. Red tiles with grey grout - looks terrible.

Has anyone successfully changed the colour of their grout ?

I know there are various grout pens available on the market. Wanting to hear if they are worth the trouble - or any other solution?

[China]

In my experience there is only one long term successful method remove the old grout and re grout.

[Bohdan]

If you just wait it will slowly turn black.

[Pete57]

Agree removing & re grouting is best solution. You may be able to lighten the colour using bleach or similar.

When we had our bathroom renovated, the tiler sat some tiles across a plank and put a few different colour grouts between them. Asked us to pick grout colour from samples.