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That would be great Kevin - how do you want me to pay for the postage?Thanks Paul
Quote from: Paul Wisdom on May 08, 2015, 07:44:18 pmThat would be great Kevin - how do you want me to pay for the postage?Thanks Paul why not just go into your local pound store and buy a bottle of Harpic h/d toilet cleaner and descaler which also contains hydrochloric acid and will give you the same result.
Quote from: Tadgh O Shea on May 10, 2015, 07:15:00 pmIf it was one of my clients i certainly wouldn't use hydrochloric acid as it would soften the surface of the slabs because through the action of the acid reacting make them more porous and also fade any colour if they have a dye in them, from the pictures Paul has posted the slabs look as if they were red at one time and have a heavy lichen growth problem, the safest and most effective solution i have come across for this is get a slow speed rotary machine with a white pad under the drive disc then put about six or seven 40 or 60 gram stainless steel scouring pads under the white pad and just scrub the slabs releasing plenty of water from the tank as you go, this method will eat through heavy lichen and also remove any ingrained soils from the slabs just rinse off after for perfect safe results.
If it was one of my clients i certainly wouldn't use hydrochloric acid as it would soften the surface of the slabs because through the action of the acid reacting make them more porous and also fade any colour if they have a dye in them, from the pictures Paul has posted the slabs look as if they were red at one time and have a heavy lichen growth problem, the safest and most effective solution i have come across for this is get a slow speed rotary machine with a white pad under the drive disc then put about six or seven 40 or 60 gram stainless steel scouring pads under the white pad and just scrub the slabs releasing plenty of water from the tank as you go, this method will eat through heavy lichen and also remove any ingrained soils from the slabs just rinse off after for perfect safe results.