Apparently, if you wish hard enough, your dirt cleaning woes will be sorted by the manifestation of this apparition:
After a particularly windy eve, we arrived on site to find this Daemon wandering about. Though we were frightened and a little confused by his appearance, we managed to bribe him with raspberry lollies and whisky into cleaning our site. Within the hour all the offensive leaves had been blown away. In celebration, the Daemon tried to blow away the sun, but that was going too far. Lollies and whisky were withdrawn and the Daemon slunk away to whatever dank hole he came from.