There are several methods to remove mold and mildew, depending on the severity. These DIY techniques will work for small patches of growth that isn't so severe. That is why it is essential to check for these spots ASAP before it deteriorates into something worst where it'll need expensive professional work. Before using any of these DIY solutions, please test it in an inconspicuous location to see if it causes any discoloration. Also, make sure to have proper ventilation (leave windows open if possible) and aerate the room so that you don't inhale spores and aerating eliminates excess moisture.