How to Remove Mold and Mildew from Bathroom Grout

Remove Mold and MildewIt happens every day: You take a bath or shower and notice black spots and lines where you used to have beautiful white or colored tile grout on the tub or shower walls. The diligent homeowner may drag out an assortment of cleaners and tackle that disgusting mess but all too many of us just let it go—too busy, too tired, too lazy, too whatever—until it becomes overwhelmingly ugly and something must be done. Unfortunately, most cleaners you can buy in the supermarket are not up to the task of removing mold and mildew from tile grout. You need a powerful cleanser and lots of elbow grease. Or do you? Here’s a method I use that works every time to clean those tile walls and remove mold and mildew.

Safety is paramount when using chemicals and using household bleach, the kind you use in the laundry, is no exception. Wear rubber, latex or vinyl gloves and safety glasses while working with the bleach and make sure you have plenty of ventilation, using the bathroom fan may not provide enough air flow and you may want to use an additional fan. You should also cover any surfaces other than the tub/shower such as the floor or adjacent walls so the bleach doesn’t do damage to those surfaces. Wear old clothes that won’t be ruined if bleach splashes on them. Remove all other chemicals and personal care products from the area so you don’t run the risk of mixing chemicals which can be hazardous.

Pour some household bleach in a container and using an old toothbrush, apply generous amounts of undiluted bleach to the grout starting up at the top of the tile wall. Allow the bleach to run down the wall and scrub the grout lines with the toothbrush. You can also use a stiff bristle brush to do this. Work your way down the wall brushing the vertical and horizontal grout lines with the bleach. Be sure to apply the bleach to joints where the tile wall meets the tub or shower pan or where one tile wall meets another because mold and mildew like to gather in those spots.

After you have covered all the grout on the walls, leave the fan on, close the door and leave the bathroom for a period of time to allow the bleach to do its work.

After a minimum of fifteen minutes and preferably longer, return to the bathroom and rinse all the walls with clear water. You can use a sprayer for this or a handheld shower, also called a personal shower, if one is available. Alternatively, you can simply pour a stream of water from an open container down the wall starting at the very top. Whatever method you use, make certain that you have thoroughly flushed the bleach from all the surfaces. At this point, you will notice that most of the mold and mildew stains are gone but you may still see some stubborn mold at the joints and junctions of vertical and horizontal surfaces and grout lines. Apply some additional bleach to these problem areas and scrub them with a toothbrush or stiff bristle brush until you remove the stains.

Allow the walls to dry, then wash them down with your favorite shower cleanser. Make sure you rinse all surfaces carefully and thoroughly.

When the tile walls have dried completely, it’s time to seal the grout. Purchase a good grout seal product and apply it to the tile according to the manufacturer’s instructions. Allow the grout seal to dry for the prescribed amount of time, usually at least twenty four hours and you can resume using your tub or shower and rest easy knowing that it may be a long time before that nasty mold or mildew returns and when it does, tackle it right away and your job will be a lot easier,

Know you know how you can clean mold and mildew from your bathroom tile and grout.  To learn how to sharpen your wife’s kitchen knives, get the best tips and techniques from me at

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One thought on “How to Remove Mold and Mildew from Bathroom Grout

  1. As per EPA, if an spot polluted with mould is bigger then Thirty sq . ft ., you have to get help of professional to do a mould removal . The simple truth is, occasionally mold can be hidden behind the walls, below the carpeting, etc. Its often a good plan to get a mold evaluation should you suspect large mold pollution. In case you in Nj, check out this company – Mold Removal NJ . All the best !!

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