Rinse the tank and all the equipment very well in regular water first (no soap). Make sure you where gloves and eye protection. All except the biowheel and any media from the HOB, that can be tossed out. Allow everything to air dry for a week. If you are sure it was C. irritans you where treating, that would be enough.
FWIW, Quick cure will not help with C. irritans. I thought you where treating for Brooklynella?
If you are unsure what killed the fish being treated, mix a weak bleach solution 10 parts water to 1 part bleach and soak for a few hours. Rinse very well, fill with FW and add a good amount of a dechlor product. Swish and let sit for an hour or so. Empty and rinse everything again and allow to air dry for a few days.
Cheers
Steve