Checked the pipe and it is good. I have a bit of an update but with no results. I decided to drain and pull the tank because honestly this is just getting annoying and I need to take care of it. So I drained and flushed both grey and black really good and then pulled the tank out and set them in a different garage. Holy crap the smell in the black tank was agonizing however it is certainly not the smell that is in the bathroom. I'm gonna clean everything really good now but I kinda doubt it will help.
This sounds weird but I am beginning to wonder if the FRP just absorbed a funky smell. When this first started occurring their had been a bunch of dial soap spilled on the floor and it was pretty damp from taking showers in there. The smell is just like damp soapy smell with a hunt of sanitation odor. I just wonder if somehow it got absorbed into the walls. Its weird but it is all I can think off.
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