Tom Silva brightens dingy grout this way: Pour vinegar straight on grout lines; use a stiff grout brush to scrub with a mix of baking soda, water, and a few drops of dish detergent. Allow sit for 5 minutes, then brush all over again. Wipe up using a damp sponge https://beauhqxce.isblog.net/not-known-factual-statements-about-house-deep-cleaning-service-44072172