1 Use a scrub brush to brush along the surface of the caulking, moving from side to side. 2  Apply light pressure or it may damage the caulking. 3  Rinse completely with water and/or scrub the surface again with the soapy water used earlier to remove any bleach residue.4  Dry the caulking with a soft towel. 5  Repeat if necessary.teps to Remove the Mold: 1  Fill a bucket with warm water. 2  Add a small amount of soap and mix until suds begin to form. 3  Wash all of the caulking with the soapy water and a soft cloth. 4  Fill a spray bottle with undiluted bleach.