My kitchen counter top has 4" ceramic tiles with 1/4" grout lines.

Over the years, and in spite of regular cleaning, grease and dirt has
accumulated in these slightly recessed grout lines and made them unsightly
unsightly. Mechanically, the grout is in good shape (no crumbling).

While I am at it I would also like to recondition the 14" floor tile grout
lines. Would they require a different cleaning procedure?

What is the easiest way to restore the grout to like-new condition?

Thanks

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