Use a mold-killing cleaner (like white vinegar, hydrogen peroxide, or a dedicated mold remover), protect yourself with safety gear, and scrub, rinse, and dry the ceiling thoroughly; if the mold covers a large area or keeps returning, bring in a professional.

Safety first

• Wear rubber or nitrile gloves, safety glasses, and a mask or respirator to avoid breathing in spores or getting cleaner in your eyes.

• If the mold covers a large area (more than about 10 square feet), is making you feel unwell, or the ceiling material is soft or crumbling, stop and call a mold remediation professional instead of DIY.

Prepare the area

• Open a window, turn on the bathroom fan, and keep the door slightly open for ventilation while you work.

• Lay down plastic sheeting or old towels and use a step stool or ladder that is stable so you can reach the ceiling safely.

Cleaning steps

• Mix a cleaning solution: options include undiluted white vinegar in a spray bottle, a 1:10 bleach-to-water mix, or a commercial mold remover (test a small spot first).

• Spray the moldy areas until damp but not dripping, let the solution sit for 10–60 minutes depending on the product (vinegar often works best if left longer), then gently scrub with a sponge or soft brush.

• Wipe away residue with clean cloths, then lightly rinse with clean water and dry the ceiling with a towel or by running a fan or dehumidifier until completely dry.

When and how to repaint

• After the area is fully dry and mold-free, you can apply a stain-blocking, mold-resistant primer and then repaint with a moisture- and mildew-resistant bathroom paint.

• If the mold keeps bleeding through paint or the ceiling surface is stained and flaky, the underlying drywall or plaster may be damaged and should be evaluated or replaced.

Preventing mold from returning

• Run the exhaust fan during and at least 20 minutes after showers, keep the door or window open when possible, and use a dehumidifier if the bathroom stays humid.

• Fix any leaks, regularly clean and dry damp surfaces, and consider using mold-resistant paint or panels on the ceiling to reduce future growth.