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Same (well that's what I did the previous two times I did the bathroom)... which was why I wondered if anyone had tried it themselves.
I guess it is just a case of raking over to key, rather than raking it out then it could be doable. We'll see what they say as they'll have a bit of downtime as they're relaying our bathroom floor.
It feels quite nice paying somebody else to do DIY for once.
Strikes me as something that would chip/flake off easily. I would take out as much of the existing grout with a grout rake then re-grout.