Someone scrubbed a stain with a scourer, or sprayed a strong cleaner and left it, and now there is a dull patch on the benchtop that will not wipe away. It is one of the most common questions we get on our stone benchtop repairs in Sydney. The short answer is that the patch is damage to the polish, not the stone, and in most cases it can be re-polished on site.
What the dull patch actually is
A polished benchtop reflects light evenly. That is what you read as shine. A scourer scratches the surface with thousands of tiny lines. A harsh cleaner eats into the resin in engineered stone, or etches the calcium in marble. Either way the surface is no longer flat at a very small scale. It scatters light instead of reflecting it, and the patch looks dull, cloudy or lighter than the rest.
The stone underneath is fine. The problem is the top few microns.
What causes it
- Scourers and the green side of a kitchen sponge.
- Bleach, oven cleaner and strong degreasers left on the surface.
- Cream cleansers with abrasives in them.
- On marble: lemon juice, vinegar, wine, tomato and some bathroom cleaners. These etch marble in minutes.
- A hot pan straight from the stove. Heat can dull and even crack engineered stone.
The advice from some installers is that the top handles anything. It does not. Warm water and a mild detergent are all it needs.
Can it be re-polished?
Usually, yes. We re-polish the patch on site, on the benchtop as it is fitted. We use compounds and pads made for engineered stone and for natural stone, working from coarse to fine until the patch reflects light the same way as the rest of the top. Then we blend the edges so there is no line between the repaired patch and the original polish.
How well it comes back depends on how deep the damage went.
| Damage | What to expect |
|---|---|
| Light dull patch from a cleaner | Comes back well, hard to find afterwards |
| Scourer marks you can see but not feel | Comes back well |
| Scratches you can feel with a fingernail | Improves a lot. Deep scratches may stay faintly visible |
| Etch marks on polished marble | Comes back well on a small etch. A large etched area takes longer |
| Heat mark from a hot pan | Often improves. Heat can change the resin, and we say so if it has |
We check the result in daylight before we leave, because a dull patch shows most in daylight from a low angle.
What you have heard elsewhere
You may have been told the top has to be replaced, or that engineered stone cannot be re-polished once it is dull. That advice usually comes from people who install stone, not from people who repair it. A dull patch is one of the most common repairs we do.
What to stop doing today
- Put the scourer away. Use a soft cloth.
- Stop using bleach, oven cleaner and cream cleansers on the top.
- On marble, wipe up lemon, vinegar, wine and tomato straight away.
- Use a board and a trivet. Heat and knives both mark the polish.
- Do not try to polish it yourself with car polish or a drill attachment. It usually makes the patch bigger.
How to get it looked at
Send us a photo of the patch in daylight, from a low angle so the dull area shows, and one from further back. Tell us what was used on it if you know. We reply with a fixed written quote within one business day and tell you how well it will come back.
