On Sunday, 1 April 2018 20:15:14 UTC+1, newshound wrote:
On 01/04/2018 19:20, Chris Hogg wrote:
On Sun, 01 Apr 2018 19:12:40 +0100 (BST), "Dave Liquorice"
wrote:

What would be the best method to get white emulsion off rough split
sandstone and the mortar (cement not lime) joints? The wanted end
result being visible clean stone and mortar. There is only about 1 sq
metre to do, indoors.

Thinking of a steam cleaner to soften the paint but how to remove the
softened paint totally from the gain of the stone? Indoors, so
sloshing lots of water about isn't on.

Mechanical with a needle gun?

Any other ideas?

If it's rough stone, then I'd use a wire brush, as the resulting rough
surface won't be much different to the original. I cleaned some slate
slab that way last week on a decorative fireplace surround that had
been cemented into place. Came up nicely.


+1

And a manual brush at that, I suspect that a cup or disk brush on an
angle grinder may leave unsightly swirls.

I lived in a sandstone building many years ago. A finger nail was enough to cause plenty of surface damage.


NT