All areas should be dried before the system is turned on again. Biocide products are available for various HVAC components such as condensation pans and cooling coils. Check with the manufacture for specifications and for handling instructions. The work area should be HEPA vacuumed and cleaned with a detergent solution. Always ventilate the area when working with bleach.
Ammonia is found in many detergents.
Vacuuming may increase exposure to mould and spores by making them airborne. No special requirements are necessary for the disposal of mouldy materials although it is recommended that the materials be sealed in plastic bags if possible.