Replacing mouldy grout

[beky]

Hi, some of the grouting around the top of my bath and between some of the tiles has been steadily going brown/black and won't come off when scrubbed anymore.
I want to re-grout, but understand that I need to remove the discoloured grouting first.
Can you tell me how to remove it please?

[Diyisfun]

Its not easy to remove it.
Have you tried washing it with bleach diluted?
If you do want to remove you need to scrape it out, you can buy a tool, be careful or you may chip the tiles. When you re grout use the correct grout.

[oldhenry]

all grout will discolour eventually, as said ,bleach is brilliant at cleaning, wear gloves etc. use a small brush - old toothbrush I use.
grouting is a messy job too but worth doing every ten years or so with waterproof grout, dig out old with a grout cutter only .

[grant.mackay]

Mix bleach and bicarb of soda into a paste put it on the grout and leave it for a while to work, then wash it off. Good quality bleach is better