How to Clean a Granite Composite Sink

Granite composite sinks often top the charts as favorite picks when it comes to wanting a clean and sparkling kitchen. They are more popular among people than other regular sinks for their toughness, elegance, and resistance to scratching. But over time, hard water stains, soap scum, and food residue can dull their sleek finish. Cleaning them properly is key to keeping their durability and appearance intact.

If you’ve been avoiding this task because you’re not sure how to do it safely, don’t worry. With our simple step-by-step guide, you'll know exactly what to do and what to avoid. Let’s get started then.

Supplies and Tools You Will Need

• Soft microfiber cloth

• Non-abrasive sponge

• Dish soap (pH-neutral)

• Baking soda

• Hydrogen peroxide (optional for tough stains)

• Whiting powder (optional)

• Rubber gloves

• Bowl or small container

• Old toothbrush

• Mineral or olive oil (optional for shine)

Optional:

• Plastic wrap

• Painter's tape (for sealing plastic wrap during stain treatment)

Caution:

1. Never use harsh chemical cleaners like bleach, chlorinated solvents, or formic acid on your granite sink. These chemicals can erode the protective sealant or permanently discolor the surface.

2. Skip any cleaners with vinegar, citrus, or ammonia. They may look harmless, but they can permanently dull or etch your granite’s surface.

Our Expert Tip: 

1. Always choose cleaning products labeled as pH-neutral for granite sinks.

2. If you’re uncertain about a cleaning method or product, reach out to your granite sink’s manufacturer. They can suggest safe options that won’t damage the surface.

Step-by-Step Guide to Cleaning Your Granite Composite Sink

Cleaning a granite composite sink is straightforward as long as you use the right products and techniques. Here’s how to do it without damaging the surface:

Step 1 – Rinse the Sink and Remove Debris

Start by clearing out dishes and other stuff so that your sink is prepared for cleaning. After that-

• Rinse the sink with warm water to remove crumbs, grease, or loose debris.

• Use a soft sponge to wipe away any immediate residue.

Warning: Do not use abrasive scrubbers like steel wool or stiff brushes. They can scratch the finish of your favorite composite sink.

Step 2 – Apply Mild Dish Soap for Daily Cleaning

For routine cleaning, do the steps mentioned below:

• Add a few drops of mild pH-neutral dish soap onto your sponge.

• Gently scrub the entire sink in circular motions.

• Rinse thoroughly with warm water.

Even after initial cleaning, water spots and other hard stains can remain. To clean them properly, go with the following steps.

Step 3 – Tackle Hard Water Stains with Baking Soda

If you notice white spots or mineral deposits:

• Sprinkle baking soda directly on the affected areas.

• Dampen your sponge and gently scrub.

• Rinse thoroughly and wipe dry.

If stains persist, go to Step 4 for deep cleaning.

Step 4 – Remove Tough Stains with a Homemade Paste

For tougher stains and grim or residue:

1. Mix baking soda and hydrogen peroxide (or whiting powder and peroxide) into a thick paste.

2. Apply the paste directly using a putty knife or a repurposed plastic or wooden spatula. Ensure the layer is roughly 1/2 inch (1.25 cm) thick for effective coverage.

3. Cover the area with a plastic wrap and seal the edges with tape. It will allow the paste to do its job by absorbing into the stone and lifting the stain out completely.

4. Let it sit for at least 24 hours (even better if you let it sit for 48 hours).

5. Remove the plastic, wipe off the paste, and rinse the sink well.

Caution: Avoid flushing paste residue down the drain. It can damage the drain pipes. Better, wipe and discard it properly.

Our Expert Tip: If you have time, let the paste sit for 2 days for even better results.

Step 5 – Dry and Buff the Sink

Once the stain is off the granite sink surface:

• Use a dry microfiber towel to remove all moisture.

• This helps prevent new water spots or buildup.

Pro Tip: Always dry the sink after each use to prevent future hard water marks.

If the stain persists after repeating the cleaning process, it may be due to etching. Etching is typically caused by abrasive substances such as vinegar, lemon juice, CLR, or rough cleaning tools like sandpaper. 

For a temporary solution and to reduce the look of etching, you can apply the following step. It won’t fix the damage, but it can hide it until you take further steps.

Optional Step – Restore Shine with Mineral or Olive Oil

Get a clean and soft piece of dry cloth and do the steps below-

• Pour a few drops of mineral or olive oil on a dry cloth.

• Rub it into the sink in circular motions.

• Let it sit for 1–2 minutes, then buff off excess oil with a clean section of the cloth.

Pro Tip: Keep the cloth flat enough so the oil doesn’t soak into it. The goal is to keep the oil in one area so it can be applied directly to the granite surface.

Regardless of hiding the stain, you can use this step to make your granite composite sink look dark, smooth, and refreshed as new.

Need Professional Help? Call Distinguished Manor Services

While granite composite sinks are easier to clean than you think, many people don’t have the time, tools, or confidence to do it right. Using the wrong cleaner or technique can leave etch marks or stains that are difficult to remove permanently.

If you are someone who is having problems cleaning your valuable sink, Distinguished Manor Services is here for you. With over 17 years of professional cleaning experience across Arizona, we know how to handle every surface in your home, including granite, marble, ceramics, and other specialty materials. With the best team in town, we are just a phone call away from getting your kitchen to shine like a diamond. Learn why regular professional cleaning is a game-changer with our Top 7 Benefits of Recurring Maid Service for a Healthier Lifestyle.

Final Thoughts

Granite composite sinks don’t need a ton of maintenance to start with. But they do need the right kind. With just a few household ingredients and gentle care, you can keep yours looking spotless and extend its lifespan. Regular cleaning, prompt stain removal, and the occasional oil buff will restore the previous shine it had.

Moreover, if you are in a kitchen cleaning spree and notice your stove also needs a wipe, follow our 4 Ways to Clean Grease Off Your Stove blog to get the job done.

Frequently Asked Questions

Can I use vinegar to clean my granite composite sink?

No. Avoid using vinegar, lemon juice, or any acidic cleaner. These can dull the finish and erode the sink over time.

How often should I deep clean my granite sink?

Deep cleaning every 1–2 weeks is enough, depending on usage and water hardness in your area.

Will my granite sink scratch easily?

Granite composite sinks are resistant to scratches, but avoid dragging heavy cookware or using sharp objects directly on the surface.