Sporekill (PCS No.92396) is another product where the active ingredient is based on potassium salts of fatty acids. It is fully registered as a PPP for use on mushroom crops. Recently, the registration label has been extended to include new uses including crate washing and disinfestation (fly control).
For flies, it can be applied by spray on walls and door/frames or by fogging the growing room after filling. It works by direct contact, disrupting cell membranes so flies dehydrate and are eliminated.
Fogging with Sporekill should also help knock down spores that have entered during filling, encapsulating them and rendering them non viable so fogging is a practice against pests and diseases at the start of a crop.
Refer to the product label for further information.