Replacing grout is certainly one way to fix the problem. Instead, use UltraCare Grout Refresh, a water-based colorant and sealer that is available in MAPEI’s full palette of grout colors. UltraCare Grout Refresh is made for refreshing the look of old, discolored grout or completely changing the color of the existing grout. Don’t replace it, Grout Refresh it! To learn more, watch the video below.