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Fill a bucket with warm water, and add 2 tablespoons (30 ml) of liquid dish soap. Swish the soap around in the water to make suds. Dip a stiff-bristled brush into the soapy water and scrub the moldy surface with the brush. Re-dip the brush regularly and scrub until the area is saturated with suds. Rinse the area with water.  Pre-scrubbing the mold will help break up the surface so that you can penetrate to the roots with your cleaner and kill the mold. There are a number of cleaning solutions and products you can use to clean mold. The most effective will be a commercial biocide or antimicrobial cleaner, which is specifically designed to kill mold. There are other cleaning solutions you can try that have proven effective, including:  Equal parts ammonia and water 1 cup (235 ml) of bleach mixed with 1 gallon (3.8 L) of water Pure distilled vinegar 1 teaspoon (5 ml) of tea tree oil and 1 cup (235 ml) of water Equal parts baking soda and water, mixed into a paste in a bowl One part hydrogen peroxide mixed with two parts water 1 cup (409 g) of borax dissolved in 1 gallon (3.8 L) of water ¼ cup (102 g) of borax dissolved in ½ cup (118 ml) of vinegar and 4 cups (940 ml) of warm water For liquid solutions, spray generous amounts of cleaner on the moldy surface that you pre-scrubbed. For pastes, apply the paste to the affected area with a knife, brush, or old tooth brush.  Let the cleaner stand for about 15 minutes. This will give it time to penetrate the mold and kill it all the way to the roots, which will prevent it from growing back. When the cleaner has had time to soak in, scrub the surface with a stiff-bristled brush. This will help dislodge the mold and work the cleaner in even farther. You can use an non-abrasive scrubbing pad to scrub the area as well. To remove any leftover mold and cleaner, rinse the area with clean water. When the mold and cleaner are gone, wipe the area dry with a towel or a squeegee. This will remove excess moisture and prevent the mold from growing back. Mold can start growing on a damp surface within 24 hours, which is why it’s important to keep the area dry after cleaning. Mold can be notoriously difficult to clean, especially in hard to reach places and on certain materials, such as dry wall and other porous materials. There are times when it’s best to call a mold removal professional, including if:  Your cleaning effort wasn’t effective The affected area is larger than 10 square feet (3 square meters) You suspect there's mold in your heating, cooling, or ventilation system You have any health concerns about the mold The mold problem was caused by contaminated water or sewage
Scrub the affected area with soapy water. Mix your cleaning solution. Apply cleaner and let it soak. Scrub porous materials. Rinse and dry the area. Know when to call a professional.