If you look closely at the pictures below you’ll notice the red tint within the existing grout lines in the before picture. This was a newly purchased home and the previous owner had decided that red would be the best color choice for the grout lines in the master bathroom (the other shower had green grout)
Tampa Tile and Grout Cleaning to the rescue!
Before:
After:
Note:The bottom row of tiles are a slightly darker shade due to a previous repair