A blow moulded bottle, branded Doby, for washing-up liquid. The bottle is made from polyethylene and has a screw top which must be pierced in the centre to allow the contents to be squeezed out. The mould marks are clearly visible on the outer surface of the bottle. The name of the product and royal warrant are printed on the front whilst the reverse has instructinos for use. Doby was produced by Thawpit Ltd of Manchester. This bottle is thought to date from the mid 1950s.