How to clean limestone pavers?

[rsv]

Hi, I have limestone pavers in the backyard, however after the rain and moisture, it seems discoloured. You can see how it was in the left-hand side under the eaves originally (Shiny) and changed due to rains after the season. Can you suggest If this needs to be pressure washed and painted to restore it?

[JacobZ]

Hi @rsv,

Thank you for your question about your limestone pavers.

As limestone is porous, fine sediment, algae and moss can set in the small holes in the stone. 

Pressure cleaning with a low to medium PSI machine with a surface cleaning attachment should do the trick. Either this Gerni 3600 Pressure Washer or this Karcher K2 Pressure Washer are good options. Both have the ability to add cleaning chemicals 

You can also use some Gerni Concrete And Stone Cleaner with your pressure cleaner to help break down and remove the tougher stuff.

There's no need to paint your pavers, but applying Crommelin Water Based Concrete And Paving Sealer can help prevent this kind of staining in the future.

Let me know if you have any further questions.

Jacob

[rsv]

Thanks, @JacobZ . May I ask if the tiles can go back to the same as shiny as before as you see them in LHS under eaves in the photo by using the recommended products?

[MitchellMc]

Those products will improve the look of the pavers and will potentially restore them to the original finish, @rsv. However, they could require further cleaning to remove all the algal build-up.

Mitchell