I used standard white grout and then put several coats of the clear sealer used to seal natural stone tiles on using an artists brush. (it doesn't take long to do as it soaks in to the grout and disappears. Any excess on the tiles can be wiped off. When dry it is invisible.
After 6 years the grout on my kitchen tiles is as white as new, even behind the hob and sink. Also in the utility room where I clean my muddy boots under the tap (The mud splashes everywhere but wipes straight off the grout without leaving a mark)
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