Grout sealer

[WhereDoesThisToiletGo]

Any recommendations for a product to deal (ill advised) cement grout on kitchen floor please?

I LOVE our porcelain wood effect plank tiles in a cool oak colour
However the tiler insisted on using Bal Flex grout which had a very limited colour choice so we ended up with joints paler than the tiles.
Looked lovely when they were new.

Now the kitchen end looks like a crime scene!
Filthy grout and the more I clean the tiles, the worse it gets as all the dirt from the tiles sinks into the grout...

I've been down there with a toothbrush (!!!) and yes, I CAN get the grout to clean up but what should I use to seal this grout to improve the look once I have deep cleaned it

Many thanks

Anyone?

Just buy a grout seal from a tile shop. Lots of them are spray on but I got a non spray one and put it on with a fine paintbrush so i knew it had covered every bit of grout. however it was a new very expensive floor. you dont need much if you paint it on unless tiles are tiny, not sure about if you spray it but 60m2 only needed half a bottle and my tile sizes varied.

Thanks. I wanted a paint on rather than spray one too.
It's just that the reviews are so varied on these products

i used lithofin grout protector and it has worked very well but i did paint it on carefully ensuring full coverage everywhere and it was onto new floor/new grout that i had let dry for 72 hours first without anyone walking on it before i protected it