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. Clean the shower tile grout Start by spraying the grouted area with a 1:1 solution of vinegar and water. Leave to soak for about five minutes and then give the area a good scrub with a grout brush or hard toothbrush. Rinse with warm water. Follow up with a paste made from bicarbonate of soda and water. Use the brush to work the paste into the grout. Then spray the area again with the vinegar and water solution. As the paste bubbles up, scrub the area and then rinse off with warm water. If all else fails, spray the area with hydrogen peroxide and leave it to sit for a few minutes before scrubbing clean and rinsing with warm water. If the cleaned grout still looks a little grey, use a grout pen to paint over the old grout. You can also use coloured grout to provide an accent and transform the space.