Brownies will clean for food...

A brownie/brounie or urisk (Lowland Scots) or brùnaidh, ùruisg, or gruagach (Scottish Gaelic) is a legendary kind of creature popular in folklore around Scotland and England (especially the north, though more commonly hobs play out their role). The Scandinavians call them tomte, the Slavic domovoi and the German Heinzelmännchen.

Customarily brownies inhabit the unused parts houses (attics, crawlspaces and wall pockets) and aid in tasks around the house. However, they don't like to be seen and will only work at night, traditionally in exchange for small gifts or food. They are particularly fond of porridge and honey. Many people (myself included) refuse to even dare sleep in a house where there is no milk, in fear of brownie reprisal. Brownies also will abandon a house if their gifts are called payments, or if the owners of the house misuse them. Some people also refer to them as Tommy-knockers, but it is generally agreed that brownies are mostly benevolent.