How To Clean Onyx Bathroom Sink - 7 Easy Steps

12th Sep 2023

Hello fellow homeowners and cleaning enthusiasts! If you’ve recently acquired an onyx bathroom sink or are considering getting one, you’re in for a treat. Not only are onyx sinks absolutely stunning, but they also bring a unique touch of luxury to any bathroom. However, with beauty comes responsibility, and this natural stone demands particular care.

I've had my own experiences with an onyx sink - moments of awe and others of panic when an accidental spill occurred. Through trial, error, and tons of research, I’ve mastered the art of cleaning and maintaining onyx sinks. Let me guide you through the journey with seven essential steps to ensure your onyx bathroom sink remains in its best condition.

7 Proven Steps To Crystal Clean Your Onyx Sink

1. Prioritize Gentle Routine Cleaning

Given its inherent nature, onyx stands out as a softer variety of stone. This characteristic makes it more vulnerable to abrasive actions, which can lead to unwanted scuffs or marks.

To clean it daily:

  • Opt for a soft cloth or a gentle sponge rather than something coarse.
  • Submerge your cloth in warm water mixed with a minimal amount of mild dish soap. This combination works effectively without being too strong.
  • With gentle strokes, glide the cloth over the sink. Remember, vigorous scrubbing is not your friend here!

2. The No-No of Harsh Chemicals

Many cleaning agents tailored for bathrooms are laden with aggressive chemicals. These can not only remove the sheen from the onyx but also inflict potential damage.

When choosing cleaners:

  • Dive into the habit of meticulously reading labels. Ensure the product explicitly mentions suitability for natural stones.
  • A golden rule is to steer clear from cleaners containing acidic components like vinegar or lemon juice. These can erode the stone's surface.

3. Promptness in Addressing Spills

Given its somewhat porous nature, onyx can easily fall prey to stains. These blemishes, if not tackled timely, can be cumbersome to remove.

In case of a spill:

  • Swiftly blot the affected area with a soft cloth. Rubbing might spread the spill, so dabbing is the way to go.
  • Encountered a particularly stubborn stain? Fear not! Turn to a stain remover that's friendly to stone surfaces.

4. The Essentiality of Drying

Onyx doesn’t favor prolonged water exposure. If water lingers, it can lead to unsightly spots or even mineral buildup.

Post-cleaning rituals should include:

  • Drying off the sink using a soft cloth that's highly absorbent.
  • This not only ensures a gleaming surface but also wards off potential water-related issues.

5. The Protective Shield: Sealing

To fortify your marble island onyx sink against potential stains and external damage, sealing comes to the rescue.

How to go about it?

  • Procure a stone sealer specifically formulated for onyx.
  • As for the frequency, marking your calendar every 6-12 months for a resealing session is a good practice. And of course, when in doubt, the manufacturer's guidelines are your best ally.

6. Handle with Care

It's imperative to recognize and respect the delicate nature of onyx.

A few precautions:

  • Heavy objects, like sizable toiletry bottles or hefty grooming tools, should be handled with utmost care. Accidental drops can lead to heart-wrenching chips or even cracks in the sink.

7. The Value of Regular Checks

Being proactive is better than being reactive.

To ensure the longevity of your milky green onyx sink:

  • Carve out some time occasionally to scrutinize your sink for any visible damages, like chips or scratches.
  • Additionally, look out for areas that might be due for a reseal, ensuring the stone remains protected.

Preventive Measures

Avoid Harsh Chemicals: Never use acidic or abrasive cleaners on onyx. Products like bleach, vinegar, or ammonia can damage the stone's surface.

Use Coasters: If you place any toiletries or containers on the edge of your sink, use a onyx coaster or tray. This prevents potential staining from products and protects the onyx from scratches.

Install Water Softeners: Hard water can leave mineral deposits on your onyx sink. Consider installing a water softener to reduce these deposits.

Benefits of Proper Maintenance

A well-maintained onyx bathroom sink not only looks beautiful but also increases the longevity of the stone. Proper care ensures that the sink remains resistant to damage and staining, ultimately enhancing the overall ambiance of your bathroom space.

Frequently Asked Questions

Now, I know when I first got my onyx sink, I had a plethora of questions. Here are some of the most common queries that might cross your mind.

1. Can I use a regular bathroom cleaner on my onyx sink?

While it might be tempting to use your go-to bathroom cleaner, many of these can damage the onyx surface. It’s always best to use a cleaner specifically designed for natural stone or a mild dish soap.

2. What should I do if my onyx sink gets a scratch or chip?

First, don’t panic. Minor scratches can often be buffed out by professionals. If you notice a significant chip, it's best to consult with a stone professional to evaluate and repair the damage.

3. How often should I seal my onyx sink?

Typically, it’s good to seal your onyx sink every 6 to 12 months. However, this can vary depending on usage. If water no longer beads up on the surface, it's a sign that it's time for a reseal.

4. I've noticed a stain on my sink, how can I remove it?

Blot the stain immediately. For more stubborn stains, use a poultice or a stone-safe stain remover. If in doubt, consult with a professional before attempting to remove the stain.


There's a unique charm and elegance that onyx brings into our homes, and if you're fortunate to have an onyx bathroom sink, you've got yourself a true piece of art. But like all beautiful things, it asks for a bit of love and attention. As I've laid out in this guide, caring for your onyx sink doesn't have to be a daunting task. It's all about gentle care, being proactive, and having a bit of knowledge on hand. Embrace these practices, and you'll not only enjoy the aesthetics but also the longevity of your stunning sink.

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