I don’t know about you, but I can’t stand the mold and mildew which forms on the caulk in my bathtub after a few months. I went for many years trying to clean the stains, but could never find a foolproof and easy way to completely remove them. Finally, I stumbled on a cleaning hack when I was in the midst of a cleaning frenzy which hit me shortly after the world went into lockdown due to COVID. This method is easy, inexpensive, and works like a charm. I have also included several other cleaning methods, but I honestly think that the method I am featuring is superior to the others.
Using gloves to protect my skin, I soak long strips of Graham Cellucotton Beauty Coil 100% Rayon in regular household bleach, then place the strips over the stained caulk. I allow the strips to sit on the caulk overnight, then remove them the next morning. The caulk is always perfectly white, as if I had laid new caulk on the tub.
As an alternative, you can use a bleach pen, but it’s a more expensive method. Other methods include applying distilled white vinegar with a toothbrush and scrubbing the caulk until the stains lift, but you have to use some elbow grease. You could also use equal parts of water and baking soda to make a paste, then scrub with that mixture. Lastly, you could dilute a tablespoon of oxygen bleach in a pint of water and either spray it onto the caulk with a spray bottle, or use the solution to scrub the stains off with a toothbrush.