How to Clean Walls and Remove Stains or Mould effectively?

Walls are often overlooked in day-to-day cleaning, after all, they’re vertical and don’t seem to collect dirt the way floors do. But look closer, and you’ll notice: dust, stains, mould, greasy fingerprints, and even crayon artwork if you have kids.

Left untreated, this buildup doesn’t just look bad, it can also trigger allergies, worsen indoor air quality, and affect your next paint job.

Whether you're prepping for a fresh coat of paint or doing a seasonal refresh, here's how to clean walls before painting, after painting, and everything in between — straight from the experts at SG Reno Cleaning.

Before You Paint: How to Clean Walls Properly

A smooth, clean surface is the key to any long-lasting paint job. Dust and grime can prevent paint from sticking well, and moisture left behind can cause bubbles or flaking.

Here’s how to clean walls before painting in 3 simple steps:

Tools You’ll Need:

• Microfibre cloths or soft sponges

• Buckets

• Warm water

• Grease-cutting detergent or sugar soap

• Household bleach (for mould)

  
  

Step 1: Wipe Down With a Cleaning Solution

For light dirt, warm water and a sponge will do. In greasy areas like the kitchen, use a diluted detergent or sugar soap.

Step 2: Rinse With Clean Water

After scrubbing, wipe the walls again with a damp cloth to remove soap residue.

Step 3: Let the Walls Dry Completely

Never paint over damp walls. Wait until the surface is dry to the touch before applying primer or paint.

🛠 Pro Tip: Use a primer or sealer to help paint adhere better and block out future stains or moisture.

After Painting: How to Keep Walls Looking Fresh

Painted walls need regular care to stay fresh, especially in homes with kids or pets. Here’s how to clean painted walls without damaging the finish.

What You’ll Need:

• Microfibre cloths or non-abrasive sponges

• Buckets of warm water

• Multi-purpose cleaner or sugar soap

• Vacuum with a brush attachment

• Baking soda or rubbing alcohol (for stains)

• Melamine sponge (optional)

  
  

Step-by-Step:

1. Dust the Walls using a vacuum or extendable duster

2. Apply Cleaning Solution according to your wall’s paint type

3. Wipe From Top to Bottom to prevent dirty water streaks

4. Rinse With Clean Water and dry with a clean towel

5. Tackle Stubborn Spots with baking soda, rubbing alcohol or a melamine sponge

   
   

Wall Stain Removal: What Actually Works?

From handprints to food splashes, walls are stain magnets. Here’s how to deal with the most common messes:

Stain Type	Solution to Try
Food or grease	Sugar soap or diluted detergent
Pencil or pen	Damp sponge + dish soap
Crayon or marker	Melamine sponge or rubbing alcohol
Scuff marks	Baking soda paste

Note: Always start gently and test on a small hidden area first.

How to Clean Mould Off Walls, Safely

Mould isn’t just unsightly, it can be dangerous. If you notice black or green patches on your walls, it’s important to treat them properly.

Here’s how to clean mould off walls:

1. Wear gloves, goggles and a mask

2. Mix a solution of 4 parts water to 1 part bleach

3. Apply with a sponge and let it sit for 3–5 minutes

4. Wipe clean with a damp cloth

5. Dry the area completely

   
   

If mould is recurring, it may be caused by underlying moisture issues, in that case, it’s best to call SG Reno Cleaning for a professional wall cleaning service in Singapore.

Prevent Mould Growth After Painting

Want to stop mould before it starts? Here’s how to protect your walls long-term:

• ✅ Apply antifungal solution like Selleys Rapid Mould Killer before painting

• ✅ Use high-quality, mould-resistant paint such as Nippon Paint Odour-less Easy Wash

• ✅ Ensure proper ventilation in bathrooms, kitchens, and laundry areas

  
  

How to Clean Writing Off Walls (Thanks, Kids)

Kids exploring their inner artist? Here's how to clean writing off walls safely:

• Spray with a multi-purpose cleaner and wipe with a damp cloth

• Dip a sponge in soapy water and wipe in circular motions

• Use a melamine sponge for tough crayon marks

• Try Selleys RP7 for pen or permanent marker stains

  
  

Be gentle! Harsh scrubbing can remove paint or cause discolouration.

FAQs About Wall Cleaning

How Do i Clean Soot Off Walls ?

Soot can come from fireplaces, candles, or cooking. Vacuum first, then use a sponge with warm water and dish soap. Avoid pushing soot deeper, dab, don’t rub.

What’s the best way to clean textured walls?

Vacuum with a brush attachment, then use a soft sponge and diluted cleaner. Wipe carefully to reach crevices and uneven surfaces.

How can I keep walls clean longer?

• Avoid indoor smoking or burning candles

• Clean spots and marks as soon as you see them

• Dust walls regularly to prevent buildup

Do I need a professional wall cleaning service?

If you’re dealing with large areas, persistent mould, or water damage, it’s best to leave it to the professionals. SG Reno Cleaning offers full home and wall cleaning services in Singapore, so you don’t have to handle it alone.

Walls are more than just backdrops

They set the tone for your entire home. Keeping them clean not only improves how your space looks but also promotes a healthier indoor environment.

Whether you're prepping for a new paint job or dealing with daily wear and tear, regular wall maintenance goes a long way.

🧼 Need a hand with tougher jobs?Let SG Reno Cleaning take care of your wall cleaning, mould removal, or post-renovation clean-ups. We make it easy to maintain spotless, fresh walls — without lifting a finger.

👉 Book your wall cleaning service in Singapore today and enjoy a home that truly shines.