We have had previous discussion about nasal rinses and I want to send a warning about them. I just had sinus surgery that included removing lots of nasal polyps. It appears polyps can be caused by bad nasal irritation, allergies, etc. Prior to my polyps developing, I was doing a fairly harsh nasal rinse that included 1% of 3% peroxide per instructions found on the web. What a mistake. The rinse was way too harsh and caused swollen turbinates also. I just want to warn people not to use peroxide in sinus rinses nor make the rinse too harsh. Just use 1/8 teaspoon of salt and baking soda (buffer) per cup of mild water. Peroxide is not to be used in the sinuses ever as its a strong oxidizer, irritant, and can possibly propagate cancerous cells.The nasal wash should never burn. Learn from my mistake. We can't prove for sure peroxide was the cause but there is evidence suggesting it could have been the cause; and its better to be safe as no medical literature supports using peroxide in a nasal wash. I just want to error on the side of safety here. Could be I used too much H2O2 but still the ENT is against its use in nasal washes. All in all here is what the ENT did: Full hollowing out of the thin bones of the ethmoid sinuses. Polyps removal. Evacuation of the sphenoid sinuses. Trimming of the swollen turbinates. Removal of cyst in the maxillary sinus Septoplasty. Packing comes out hopefully today - ouch!!!!!!