Possible Causes Nicotine Residue – Smoke stains can resurface in humid conditions. Soap & Hard Water Deposits – Mineral buildup from repeated splashes. Mold & Fungi – Some molds appear yellow in early stages. Paint Oxidation – Moisture can react with paint, causing discoloration. How to Clean It Nicotine Residue – Vinegar and baking soda help remove stains.
Soap & Hard Water – Use a descaling agent or vinegar solution.
Mold & Fungi – Clean with bleach or vinegar; ensure ventilation.
Oxidized Paint – Repaint with a stain-blocking primer if needed. Prevention Tips
Ensure good ventilation (use an exhaust fan or open windows).
Wipe surfaces regularly to prevent buildup.
Address mold or mildew immediately