Q: How can I remove and prevent mold and mildew?
A: There are a number of defenses against mold and mildew, the ventilation being number one. Leaving a window open can help but is not always feasible especially in the colder months of the year as well as hot and humid conditions. Installing an exhaust fan in these areas is overall the best option. Consider installing a fan that is directly wired to your light switch so that whenever the light is on the fan is running. This way no one will forget to use the fan when necessary.
You may also consider waterproofing the room. Harmony by Sherwin-Williams paint products has properties that inhibit the growth of mold. You can also have mold-inhibiting additives added to paint for an additional cost.
On non-porous surfaces like tile, bleach detergents can usually be used to wipe mold and mildew away. On porous surfaces like sheetrock, you will need to remove the material and replace it to eliminate the source of the mold. The sooner this is done, the better.