What is the origin of the idiom "daft as a brush" and when to use it?

The idiom "daft as a brush" is believed to have originated in British English and gained popularity in the 20th century. The phrase likely emerged as a colorful and playful way to describe someone's eccentricity or lack of common sense. This phrase is often used in a lighthearted or affectionate manner to playfully tease or jest about someone's unconventional behavior or lack of practicality. However, it's important to use idioms like this with care, as they can be considered derogatory or offensive if used to insult or demean someone.