On 26 Nov 2004, Christian McArdle wrote

the grout by the cooker gets irretrievably dirty after about 4
years' use, which means I've spent a total of two days'
maintenance in scraping that part out and regrouting.

Do consider using a sealant, like Lithofin KF StainStop on the
grout. It really does massively reduce the amount of staining.

Sounds good -- I'll certainly look into that.

--
Cheers,
Harvey