Leaves , when they turn brown, can release tannin which is a very strong dye. Tannin is the stuff in tea that can stain a china tea pot so it is not surprising that it can stain stone surfaces.
Plants can also cause stains when green parts, bark, flowers and petals, pollen and seeds etc. fall on the stone.
Usually, these stains are relatively easy to remove using Biorase, please follow instructions on our site.
These methods are successful in more than 98% of cases.
Make sure you follow these instructions and ask for help if you need it.
Do not use standard brick or patio cleaner as this is likely to contain hydrochloric acid which can be disastrous.
Pressure washing can be used but is not essential. Pressure washing can easily damage stone. If you use a pressure washer please read our guide first by clicking here.
Refer to full product guides and safety data on the product pages.
Guidance for using a pressure washer on external stone and patios
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