How to Clean a Sandstone Patio

Cleaning a sandstone patio is inexpensive; homeowners probably have the necessary materials on hand.

Sandstone is a siliceous stone, composed of particles such as quartz or silica. It is less expensive and easier to cut than granite and comes in a range of colors; adding this to its durability makes it a popular choice for outdoor patios. Over time, collected dirt, vegetation and even algae or moss can dull the color or stain the surface of the sandstone pavers. While care must be used in choosing a proper cleaner to avoid damaging the porous surface of the patio, restoring a new look to the patio really just requires some elbow grease.

Things You'll Need

• Acid-free, mild soap (such as mild dish detergent)
• Large bucket
• Stiff brush with a long handle
• Waterproof work gloves
• Bleach
• Sponge

Instructions

1. Pull any weeds that are poking up through the sandstone pavers. This will make cleaning the patio easier, and weeds will not get stuck in the brush during the cleaning process.

2. Add the correct amount of cleaning fluid to a large bucket of water following the manufacturer's guidelines. The water temperature will not matter in the cleaning process.

3. Don a pair of waterproof or latex work gloves -- such as used for household cleaning -- to protect your hands while cleaning the patio.

4. Dip the stiff-bristled brush into the soapy water. Begin with one section or corner of the patio and vigorously scrub the pavers in a circular motion with the brush, applying cleaning solution freely.

5. Continue around the circumference of the patio. Additional scrubbing may be needed on areas that are excessively dirty or appear stained. Repeat the process until the entire patio has been scrubbed clean.

6. Rinse the patio with clear water. Allow it to dry, and examine the sandstone to see if there are areas that need repeat scrubbing. If so, repeat the process, making sure to rinse off the cleaner to remove any soap residue.

7. Prepare a solution of equal parts bleach and water in the bucket. Using a sponge, apply this solution to any areas of the patio that appear black. If the stain remains stubborn, use the stiff brush to apply the bleach; rinse the area thoroughly.

Tips & Warnings

• Sealing the sandstone is recommended by many experts, but others do not feel it is necessary and could stain or discolor the sandstone over time.

• Cleaners designed for sandstone are available, but mild household cleaners may be just as effective and less expensive to use.

• Do not use a cleaner with any form of acid or lemon juice, as this will stain or pit sandstone. However, household bleach can be used without causing damage.

• Do not use a pressure washer on sandstone. Small particles of the stone can be washed out from the vigorous force of the water, causing it to eventually pit.

References

• Paving Expert: Cleaning Paving
• "Fine Gardening"; Choosing the Right Paving Materials; Andrew Schulman
• Gosford Quarries: FAQ About Gosford Quarries & Sandstone

Resources

• Granite Sandstone Suppliers: Sandstone Care
• Marble Institute of America: Natural Stone Care & Cleaning