Member States shall ensure that:

1. (a)

   the disinfectants and insecticides to be used and their concentrations are officially approved by the competent authority;

2. (b)

   the cleansing, disinfection and, if necessary, insecticide operations are carried out under official supervision in accordance with:

   • the instructions given by the official veterinarian; and

   • the principles and procedures laid down in Annex II.