Re-grouting

[Unused Account 1]

Theres a cheap tool that looks ok,called regrout tool ,have a look ,

 

[Diggy]

The grout comes out a lot easier if you rip off the tiles at the same time.

Diggy :0)

 

[StevieBoy]

Multi tool sounds like your best bet.

 

[dean.diy]

@Diggy , awarded " best answer to unwanted job request ". Grout usually belongs to bathroom with jammed shut window and extractor fan stuffed with talcum powder.