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.