Method and apparatus for treating cloths by spraying with a chemical dispersion including a liquid, the method including: inserting the cloths in a drum that is rotatable about its longitudinal axis, the drum including paddles, where for each of at least two of the paddles the paddle's longitudinal axis forms an angle α of between 5 degrees and 85 degrees with the geometrical orthogonal projection of the paddle's longitudinal axis on a geometrical plane which is normal to the drum's longitudinal axis; with a dispersion supply system providing the chemical dispersion to spraying elements; with rotation elements rotating the drum about its longitudinal axis and reversing the rotational direction at least once, and with spraying elements spraying the drum's interior with the dispersion, the spraying elements being attached a to movable door of a chamber enclosing the drum. The apparatus is adapted for executing the method.