Good luck.

You missed the point of the analogy, which isn't surprising, considering this post.

And because I'm actually trying to fucking help you, I'll try to explain the basic concept of sterile work.

First of all, the air is contaminated. PERIOD. The air is FULL of spores and dirt and skin and bugs. Spores are everywhere, and with every breath you take, you inhale thens of thousands of them. If you sterilize grain and leave it out on the counter, open, it will contaminate.

So.

You say your cake flushed three times?

How did you harvest these mushrooms?

There's no way to fruit mushrooms in a tub and harvest them without exposing the whole thing to AIR. Which is how everything contaminates, because of exposure to AIR. You opened your tub and harvested mushrooms off this cake. You opened the tub to spray. You opened the tub to exchange air.

I know how to fucking grow mushrooms. I know how contamination works. I know how sterile technique works.

You can't fucking put a dirty-ass cake directly into sterile fuking rains and expect it to not contaminate.

If you expect anything but failure, you are not thinking properly.

You're not a fucking pioneer.

You're an idiot.

You need to learn what it is you are doing before you start experiemnting.

I won't try another analogy because they're wasted on you, but this is failure by definition and you are stupid for not being able to see it.