Outdoor limestone can be a beautiful addition to any home or landscape. However, it requires regular cleaning and maintenance to keep it looking its best. Here are some tips on how to effectively clean outdoor limestone.
Assess the Limestone
The first step is to assess the type of limestone you have and its current condition. There are several types of outdoor limestone used in landscaping, including:
- Travertine – This is a type of limestone formed by natural mineral springs. It has a distinctive pitted surface.
- Limestone – True sedimentary limestone is formed from calcium carbonate and has a smooth, pale look.
- Tufa – This is a porous limestone formed by evaporation. It has a spongy, layered appearance.
- Coquina – This limestone is composed of fossil shell fragments and has an irregular look.
Inspect the limestone for any existing dirt, grime, mold, or mildew buildup. Also note any previously applied sealers or coatings. This will help determine the best cleaning method.
Clean with Mild Soap and Water
For routine cleaning of outdoor limestone, a mild soap and water solution is usually sufficient. Here is a simple process:
- Mix a few drops of dish soap into a bucket of warm water. Avoid detergents, which can be too harsh.
- Use a soft bristle brush and scrub the limestone with the soapy water. Apply gentle pressure.
- Rinse thoroughly with clean water to remove all soap residue.
- Allow the limestone to air dry completely.
This mild soap and water wash helps lift dirt and grime from the surface of the limestone. For tougher stains, a bit more cleaning power may be needed.
Use Baking Soda and Water Paste
For more stubborn stains or buildup, make a paste of baking soda and water. The baking soda offers extra cleaning power. Here is how:
- Add 1/2 cup of baking soda to a bowl.
- Slowly stir in water until you achieve a thick paste consistency.
- Apply the paste to stained or dirty areas of the limestone.
- Let it sit for 5-10 minutes so the paste can break down the grime.
- Use a stiff nylon brush and gently scrub.
- Rinse thoroughly with clean water.
The baking soda paste is safe for limestone but strong enough to lift away tough dirt and stains without damaging the stone.
Try a Limestone Cleaner
For heavy-duty limestone cleaning, you may need a specialized stone cleaner. Look for a product specifically formulated for use on limestone. Avoid acidic cleaners which can etch and damage limestone.
Follow product instructions closely. Limestone cleaners are often concentrated, so you will dilute with water before applying. Use a nylon bristle brush or sponge mop to wash the cleaner over the stone. Rinse thoroughly.
Only use a limestone cleaner periodically as needed. Overuse can strip away natural oils in the stone.
Pressure Wash Periodically
For more intense cleaning, use a pressure washer. This is a good occasional deep clean for outdoor limestone.
- Remove any furniture, decorations, or accessories from the limestone area.
- Pre-wet the limestone with regular water. This prevents absorption of cleaning solutions.
- Mix a mild soap solution according to pressure washer instructions.
- Apply the soap solution and let it soak for 5-10 minutes.
- Rinse thoroughly to remove residues.
Take care not to damage porous limestone with an excessive pressure washer level. Move the nozzle constantly to prevent etching.
Reseal Outdoor Limestone
After deep cleaning outdoor limestone, resealing is recommended. This helps protect the freshly cleaned stone.
Look for sealers specifically designed for your type of outdoor limestone. Penetrating and enhancer sealers work well to repel stains without excessive shine.
Follow manufacturer application and drying time instructions closely. Reapply sealers periodically to maintain protection.
Proper sealing is key to keeping outdoor limestone looking beautiful between cleanings.
Tips for Maintaining Outdoor Limestone
Regular maintenance is important for outdoor limestone. Here are some useful care tips:
- Sweep or blow leaves, grass clippings and other debris off regularly. Don’t allow accumulation.
- Check for spills or stains after gatherings and clean promptly. Don’t let them set.
- In snowy regions, promptly remove snow from limestone with a plastic shovel to prevent salt damage.
- Prevent rust stains by ensuring metal furniture feet have felt pads.
- Test cleaning solutions on an inconspicuous area first to check for any adverse reactions with the limestone type.
- Reseal outdoor limestone every 1-2 years for best protection.
With proper care, outdoor limestone can stay beautiful and withstand the elements for many years. Follow these cleaning and maintenance tips to keep your outdoor living space looking its best. Let that gorgeous limestone shine through!