I took classes for flasking seeds and my instructor has been a God-send. I recently had contamination that was also fungus. My instructor scooped out all of the protocorms and mixed a bottle of 100 mls water and added 1 ml straight Clorox and 1 drop of dish soap. Swirled them around for about 3 minutes. Then rinsed them by pouring them into a strainer and let the soapy water drain off, then rinsed very well with sterile water. Put them into a new sterile flask and added about 3 mls sterile water and a couple of drops of PPM (You can also get this from Phytotec under the name of PTC3) Saved my flask.