Feudel.

Borrowed from Low German Feudel, Feul, Feil, either from or cognate with Dutch feil (“floorcloth”, attested 1616). Further origin uncertain. Ripuarian Fuddel (“old rag”), if related, would suggest that the d is original, whereas all of the following theories require that it is due to hypercorrection: * From Old French faille (“headscarf, veil”), but this is itself of unknown origin and the sense is only a vague match. * From Proto-West Germanic *fāgil(u), *fegil(u), a hypothetical tool noun of *fāgōn, *fegōn (“to clean, brush”), whence Dutch vagen, German fegen. * From corruption of Proto-West Germanic *þwahilu, tool noun of *þwahan (“to wash”). Compare Dutch dweil, Middle Low German dweile (“cleaning cloth, floorcloth”). This would be the easiest explanation as Dutch dweil and feil are entirely synonymous. A development þw → f is also phonetically plausible, though there seem to be no analogous examples.