Those white stains that appear on walls (efflorescence) are lime salts that rise with moisture. They do not come off with pressure alone, they need a proper product, applied carefully so as not to attack the render.
Why it is not worth putting off
Efflorescence is a sign of moisture migrating through the wall. Cleaning improves the look, but it is worth understanding the source of the moisture so it does not keep coming back.
How we do it
- A specific product for efflorescence/lime, applied locally
- Controlled pressure, suited to the render
- A prior test on the surface
- Advice on the likely source of the moisture
Mistakes we see (and avoid)
- Strong acid, attacks the render and the paint
- Scrubbing dry, spreads the salt
- Ignoring the source moisture, the stain always comes back
Guide price, no surprisesAlways an invoiceBefore/after photosNo prepayment