Nasal sprays generally do not reach the sinuses in the acute infection situation, mostly due to the swelling of the sinus ostia (openings). As the offending agent – virus, bacteria, mold, allergen, whatever – is rinsed away by daily nasal saline rinses, that inflammation subsides, and along with it the swelling. As that happens, the rinses DO reach the sinuses. At least, this has been my personal experience.
Re Xylitol: the ideal concentration, at least according to the clinical studies that have been done, is 10%. That is the concentration that is present in the “Xlear” (pronounced “clear”) products – their nasal sprays and sinus rinse packets. That’s 10% by weight / volume. So in a one-liter bottle, that would be 100 grams of Xylitol. I have to admit, I don’t have a gram-scale, and simply add a couple tablespoons to my rinse bottle.
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And best success!