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This guide is for polished cast iron fireplaces only. Do not use these methods on black or painted finishes.
Rust can appear on polished cast iron when moisture is left on the surface or damp air circulates around the fireplace. Light surface rust can often be removed simply using WD-40 sprayed onto a clean cloth, but it’s important to work carefully. Using a coarse abrasive or rubbing too hard may scratch the polished finish.
You will need:
Make sure the fireplace is completely cold before you begin.
Remove loose dust with a soft brush or dry cloth. The cast iron must be completely dry before treating the rust. Do not wash it with water, as moisture left on the surface may cause further rusting. Protect the hearth, tiles and fireplace surround before applying any products.
WD-40 is always our first choice and will typically remove around 80% of light surface rust. Simply spray a small amount onto a clean cloth, apply it to the polished areas of cast iron and gently work over the affected area. If this removes the rust, there’s nothing else you need to do. If some rust remains, follow the steps below using a metal polish.
Apply a small amount of metal polish to a clean cloth. If the rust is heavier, you can use a nylon scourer and gently work the polish over the rust mark. Use light pressure and concentrate only on the affected area. Wipe away the residue with a clean cloth and check the surface.
For more stubborn rust, use a small piece of 0000-grade wire wool with the polish. Although this is a very fine grade, use it carefully to avoid scratching the cast iron. Repeat the process gradually rather than trying to remove all the rust in one go.
Once you’ve removed the rust, wipe away any remaining product and buff the area with a clean, dry cloth. This removes any loose residue and helps restore the polished appearance.
Do not apply metal polish to:
Highlighted fireplaces contain both polished and matt-black sections, so only treat the polished details.
Light surface rust can usually be treated with metal polish, but deep rust or pitting may require professional restoration. Stop if the cast iron is heavily corroded or the finish begins to look uneven. Aggressive sanding may permanently alter the polished surface.
Keep the fireplace dry and avoid cleaning it with wet cloths or household sprays. A regular light application of WD-40 can help prevent the polished cast iron from rusting. If water is spilt onto the cast iron, dry it immediately. Regular dusting and occasional polishing can also help you spot small rust marks before they become more difficult to remove.
For general care advice, read our guide on how to clean and maintain a cast iron fireplace.
You can also browse our range of cast iron fireplaces or contact us if you’re unsure which care product to use.
Phone
01773 718718
Email
sales@castfireplaces.co.uk
