The back yard of the holiday cottage can get slippery in wet weather due to moss and algae. It has a Victorian blue brick surface. Weeds love to grow in the joints between the bricks. As needed, we pressure wash the surface to remove the slippery growth, it also looks better for new guests.
Sadly the mop bucket (centre picture) had to be replaced afterwards. The plastic become hardened by the ultraviolet sunlight and it cracked when the pressure jet hit it.