Big puddle of white stuff on patio, next to fence. Workmen next door
appeared to have emptied their slops through fence on to our patio.
Tried white spirit, soap water, white stain goes away but when the
area has dried, it "reappears". Not 100% sure what it is, thought at
first was paint, but could be something worse, like a type of cement.
Any idea how to shift it please? (Did think of pressure washer, but
we'd have to hire one.) Neighbours aren't around to discuss prob, as
building seems to be empty - prolly to be put up for let sometime
soon?

TIA, Rob.