To remove mildew and mold from a bathroom tub, create a baking soda and bleach paste, spread onto the caulk, cover with plastic wrap, allow the paste to sit for a few hours, and then clean off the residue with water. Other natural mildew cleaning solutions include white vinegar, lemon juice, tea tree oil or hydrogen peroxide.
Wear clothes that can be ruined, as beach may stain or cause holes in clothing. Be sure the area is well-ventilated or wear a mask. Prepare all supplies needed: a bowl, baking soda, bleach, disposable brush and plastic wrap.
Mix baking soda and bleach to create a paste in the bowl. Do not dilute the bleach. Use the brush to spread the mixture over all the caulk. Cover the caulk with a layer of plastic wrap to keep the paste from drying out. The paste needs to sit for a few hours, giving time for the bleach to work. Periodically check the caulk for whitening.
Once the caulk has whitened, remove the plastic and clean the area with water. If spots need further whitening, place bleach in a spray bottle and spot clean.
Dilute tree tea oil and hydrogen peroxide before using. Use a toothbrush or spay bottle covered in a solution and spot clean affected areas. Allow the cleaner to sit on caulk for an hour then rinse with water. Tree oil should not be rinsed off.