The usual east-Yorkshire spelling of ‘fimble’, a word recorded from 1484 (OED). It is literally ‘female hemp’, and it applied to both the male plant and the fibre from it.
To clean, the usual spelling in Yorkshire of 'to fay'. The OED has examples of the same word from c.1205 to 1400, spelt ‘fay’, meaning especially to clean weapons.
Ultimately from a word for ‘thread’, a diminutive. It developed a wide range of meanings but clearly meant a head-band or necklace in some early references.