Hi, I have recently had the pointing on a sandstone wall done. Unfortunately some of the mortar has marked a nearby new wall which is rendered with K rend. Can I use brick acid to clean it?
Hi John,
Thanks for your reply. Yes I have a go with a brush and water, even escalated to a power washer. It is a few marks, notably a handprint and they have set hard. I agree totally that is should be soft but it is just not moving.
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