Empty Wild Bird Suet Ball Plastic Tubs (Sharmans Cross B91)

Empty Gardman Supreme Suet Balls plastic tubs. Height approx 9"/225mm, Diameter approx 10½"/270mm. Labels have been removed. About half have been washed, the remainder are best cleaned. They're tapered so when empty can be stacked one inside another, similar to take-away drinks cups. From my experience prolonged storing outside (several months?) is inadvisable because the plastic becomes brittle.