I wonder if 30% Vinegar would be useful for drain gunk. (do not get this stuff on your skin, do not splash in your eyes, do not inhale - https://pfharris.com/products/harris-30-vinegar-128-fl-oz
The top load washing machine where i house sit smelled like it was used to wash road kill. I tried a hot bleach water load and that dampened the stench but did not wipe it out.
The home owner hired a house cleaner and she used 30% Vinegar in it.
It did the job, the machine is no longer smelly.
For catching hair before it clogs shower/tub drains my ex swears by these https://www.amazon.com/Catcher-Bathtub-Stopper-Protectors-Cleaning/dp/B091YT7HKL/
Renner is lucky to be alive.
"I expect death to be nothingness and by removing from me all possible fears of death, I am thankful to atheism." Isaac Asimov