April 14, 20224 yr Just now, pocster said: environmental trying to avoid acid and bleach All cleaning products have an impact - but used correctly they are fine. The Lithofin products are alkaline but to get that black off you’re looking at either chemical or mechanical cleaning. You could re-face the quoins with a diamond honing disk in a grinder but you would need to be very careful. I would start with Lithofin and a scrubbing brush and plenty of clean water and see how it goes.
April 14, 20224 yr 23 minutes ago, pocster said: As you say . Don’t want to damage the stone . Also environmental trying to avoid acid and bleach . As says 19 minutes ago, PeterW said: All cleaning products have an impact - but used correctly they are fine. RTFM, or spend the rest of your week with a bucket of deionised water (in itself very environmentally damaging) and a toothbrush.
April 14, 20224 yr Author @SteamyTea not trying to remove cement from quoins / copings . Just deeply embedded dirt / pollution.
April 14, 20224 yr 2 minutes ago, pocster said: @SteamyTea not trying to remove cement from quoins / copings . Just deeply embedded dirt / pollution. Ah, right. Paint it white.
April 15, 20224 yr On 14/04/2022 at 00:01, TonyT said: BC5L? everbuild acid ? Its definitely high concentration bleach, just not sure on the brand name
April 19, 20224 yr Author Struggling still with the black Lithofin Had little effect . For the quoins resorted to dilute bleach 😞
April 24, 20224 yr Author Spent all today trying everything to clean these Quoins. No joy!. Any other products to recommend??????
April 24, 20224 yr Author 1 hour ago, TonyT said: As per previous reply. Doff.. Isn’t bleach , bleach though ?? Bleach works to some extent . But I can scrub 1 quoin face for 25 minutes . Just imagine …. Me in the street with a bottle of bleach , swearing - like a local alchi . There must be an easier way .
April 24, 20224 yr Stop faffing and get some brick acid. Hydrochloric is what you want. I just cleaned the bottom few courses of my pillar with the flints in. (Just wanted to see what it'd look like). The label is worn off of my 5L container but I did one wash with it dilute 1:1. Nasty stuff, I wore a rain jacket, rubber gloves and a full face Bionic visor. Use a scrubbing brush and dip in the dilute acid. Scrub from left to right. Hose off: Going to give a few days for the mortar to go off then acid wash from the top down. Should clean the brickwork and bring the black of the flints out.
April 24, 20224 yr Author 1 hour ago, TonyT said: Doff https://www.concreterenovations.co.uk/news/a-brief-guide-to-doff-cleaning/ Don’t want no man in a gown rubbing my rocks !
April 24, 20224 yr Got to sort that fence out on the right too...not mine but I'm going to see if they mind me putting in concrete posts and criss cross trellis to match mine.
April 24, 20224 yr 10 minutes ago, Onoff said: Got to sort that fence out on the right too...not mine but I'm going to see if they mind me putting in concrete posts and criss cross trellis to match mine. Before or after finishing the bathroom? Is THIS thread really 4 years old?
April 24, 20224 yr Author 44 minutes ago, ProDave said: Before or after finishing the bathroom? Is THIS thread really 4 years old? Still waiting for him to box in the (expletive deleted)ing boiler
April 24, 20224 yr 1 hour ago, Onoff said: Got to sort that fence out on the right too...not mine but I'm going to see if they mind me putting in concrete posts and criss cross trellis to match mine. very generous calling that a fence 😀
April 25, 20224 yr 9 hours ago, ProDave said: Before or after finishing the bathroom? Is THIS thread really 8 years old? Rolling forward to 2026...
April 25, 20224 yr 8 hours ago, pocster said: Still waiting for him to box in the (expletive deleted)ing boiler Cheek, you've had captives in that basement for longer!
April 27, 20224 yr Author Today I tried this product Here is before and after . We are looking at just the area above the broom handle and to the left - a test …
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