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Not always as the cleaner is highly effective. But a pressure washer at relatively low pressure will need to be used to clear the joints between the pavers.

Grout is porous when applied, some companies or mixes do incorporate a sealing additive, but this only has a limited lifespan. If not sealed, the grout is likely to stain, appear discoloured and very difficult to keep clean.

In current European legislation, a biocide is defined as a chemical treatment that has been formulated to kill, destroy or have a controlling influence on an organic organism such as algae or lichen.

No, if left to long it might start to crystalise and dry white on the surface, but it will not damage the surface. If this does occur, it can be removed by either a stiff broom and water or a pressure washer.

Unless over applied, or applied to the wrong type of stone, the sealers should not make the surface more slippery.

Yes, StoneCare4U-Approved Patio Cleaning Contractors cover most parts of the UK.