Uhhhh...I would think the milder solution afterward would be unnecessary. I use the cleaner & bleach spray. I spray down a towel and start wiping the walls and floor. That's all I do. I do not have the fortitude to be that anal about trying to have a closed system that could keep spores out. Know what I mean? I'm growing in soil. I mean there's visible bugs and shit moving around in my dirt. I have big ass worms. You think I'm going to give a damn about trying to keep mold spores out? Hell no. I will try to keep it from being an environment they will thrive in. I try to be a better and more consistent cultivator so the chances of diseases don't take hold. I'm still new (growing cannabis) so please understand that I'm not coming at this with years of wisdom. The mental approach to not becoming overly burdened or paralyzed by the details IS something I struggle with. I wanted to share an example of something I had to let go. Mistakes happen, you didn't disinfect the tent. Oh well. Finish this grow, disinfect the hell out of it after.
It actually concerns me that it has NOT spread to other plants. Make sense? If this was a spore, it's purpose is to spread and multiply. Typically not on only one host. Could this be something in the root zone? Not to bring in more concern but it makes sense to my brain that certain places are necrotic and it is only on this plant. It could be disease in the soil. Certain sections of the roots are rotting or dying? Either way, the preventative PM foliar is a must. The soap will aid as a pest control as well!