DIY remedies to get rid of dirty bathroom grout

Dirty grout around water outlets is a perennial problem that will spoil the look of any pale to grey grouting.
There’s nothing that mucks up the looks of your bathroom, old or new, like dirty, mouldy or discoloured grout.
It’s a creeping problem that can defeat even the best mechanical ventilation if not addressed. Degrading grout is not something to ignore as that classic mixture of water, cement and sand is part of the overall waterproofing of your bathroom, especially around showers and basins.