Hello all! Is anyone able to identify what this is. Photo attached. Just moved into this rented property and it is half covered in climbing plants. It's a nightmare. But all over the walls is this and it looks like it's covered in white paint. The walls look like they have white paint on using a sponge? Is it to prevent the climbing plants or even to aid it or do you think its old pices of plant covered in paint. The walls are covered top to toe with this stuff