Best method to remove grout without damaging the tiles

[Lee garnham]

Hi guys
iv got a big shower room in a golf club that needs re grouting as the white original 3mm grout isn't very white any more! Just wanted if there is a quicker method out there!
many thanks

Run a mile lol. Try and clean it or re tile. Re grouting is a nightmare. Marcrist do a grout removing grinder blade that might be your best bet if you def have to do the job. If you got plenty of work on personally I wouldnt be interested its more headache than its worth