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You are up for a no easy way task. At most big box stores they sell in the tile tool department a little tool that looks like a nail file , it's head is about 1/8" wide, use this tool like a file in the grout lines to remove the grout.
Make sure your careful around the corners of the tiles as to not chip them.
You don't need to remove all the grout just about an 1/8" down will be fine, then vacuum out the joints and apply new grout.
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