OP, as I'm sure you're aware, Cocaine is super corrosive when it comes into contact with soft tissue. Aside from this objective problem, you could just have a sinus that is not totally efficient at draining. I went through this as well. My sinus was just misshapen for some reason and it was allowing bacteria to multiply in my sinus and cause infection. If this is the case for you, then snorting Cocaine would be extra harmful.
Is the sinus in question completely closed up when you do the Neti Pot?
Yeah, personal experience of OP's clogging troubles was horrible.
Used to be very into coke, but this issue (along with a death and very deep depression) is exactly the cause of absolute cessation..
Tried countless solutions to no avail, problem grew increasingly worse, kept preventing insufflation, and clogging happened faster and faster/easier with each binge and each and every line, eventually led to bad sinus infection ( even though product was consistently of decent quality), etc etc etc......
By the end, it was unbelievably severe, the whole ordeal became mentally excruciating and absolutely impossible to solve.....couldn't fucking stand it.
After exhausting every fucking possible solution, was forced into waving white flag by parting ways with my beloved coke lifestyle...sucked so damn bad...
So, in my case, the only successful course of action in the end, was cessation. Considering the circumstances OP has expressed, I strongly suspect this will be the case for him as well, unfortunately....I feel his pain ��
Hoping for better outcome for you OP, but you gotta be logical and realistic about it with yourself here, realize when presented with the facts indicating when it's appropriate to simply fold (which I expect will ultimately be what you are faced with). Coke is far too damn expensive to waste and deal with this kind of bullshit.
Sorry for the grim reality of facts I've presented, but just the way it is.
But considering not only your main subject of difficulty, but also other circumstances within your posts, this really may be a quite positive thing. Cocaine can become very problematic, so this may actually be a blessing for you.
Regardless of your decision and results/outcome, I wish you the best of luck OP.
Best regards,
-PA