It is best to clean, seal and install pave set as soon as possible after the paving has been laid. Sealing and installing silica jointing sand assists with maintenance. If this has been done, then from time to time a clean with a high pressure or garden hose.
Use a high pressure hose to give a general clean, this should remove any loose surface dirt. If any marks remain you can “spot” clean. Using napisan and water, mix to a thick paste and apply to stain. Agitate on the stained area using a coarse broom. Leave on the surface for a few minutes then rinse with water. Reapply if necessary. Napisan bleaching quality will help remove the stain.
If the area is badly marked, then a weak Hydrochloric Acid Solution can be applied. Dilute 20 parts water to 1 part Hydrochloric Acid. Apply to stained area using a watering can, gently agitate the surface of the paver. Don’t leave on for long, as the surface of the paver may be damaged. Then rinse thoroughly with fresh water.
On the completion of your paving, it is strongly recommended the paving is cleaned and sealed with a reputable sealing product that is suitable for limestone based paving products. The choice of sealer is dependent on what could potentially impact your paving and the finished look you are after:
- Penetrating sealers will stop/repel any potential stain from entering the paver without altering the appearance of the paver, however the surface may still become scuffed and require cleaning to restore its appearance.
- Surface sealers, generally acrylic, provide a strong surface barrier between the paver and any potential staining. The application of this particular sealer will result in pulling the colour to the top of the paver giving a slightly darker appearance and leaving a low gloss sheen. These types of sealers may create a slip hazard when the paver is wet, so it is strongly advised to incorporate a Slip Resistive Additive (SRA) into the sealer prior to application.
We recommend the use of a silicon based jointing sand when the laying of your new paving is complete. This jointing sand is swept into the paving joints and then dampened with a hose. The silicon absorbs the water and bonds with the sand to create a flexible paving joint that minimises the impact of ants and weeds on your beautiful new paved areas.
It is likely that the fertiliser you used contained some tannins or oxides that have created the stains. Both of these can be removed by scrubbing with a paste or glycerine and talcum powder.
Moss stains are best lifted from the pavers by first brushing the area and then soaking it in a solution of vinegar and water. A gentle wash with water after ten minutes should remove the stain. Source: House & Garden magazine.
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