have you thought about a mechanical solution? I've just cleaned brickword well with a wire brush attachment that goes on your drill - it makes a lot of dust but gets good results...
Ok quick question for you. Just moved into a 3 bed semi house - has a decent sized understairs cupboard that would make a very nice second bathroom (toilet / sink). Problem is that the fusebox and mains supply and meter are all mounted on a wooden board inside the cupboard.
I looked at...