Dirty grout turns off home buyers. If you are a Pinterest fan like I am, you can find all sorts of homemade recipes that usually include some combination of lemon juice, vinegar, baking soda, and water. You can find great deals in the Jacksonville Mint magazine or on Angies List to have it cleaned professionally. We had ours done for less than $100 and it included a sealant, guaranteed for 5 years. Now that’s a selling point!