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Food grade hydrogen peroxide should not be used straight. It is very strong and dangerous at 35% strength. It must be diluted to 3% (11 parts water plus 1 part 35% hydrogen peroxide.) Then it still needs a lot of dilution again even before using in the sinuses.
And it's not a good idea to use it as mouthwash. Hydrogen peroxide (in dilute form) is used as a tooth whitener (check the active ingredients on those gel-based tooth whiteners, they usually use H2O2). It also has the side effect of turning your gums pale temporarily, though it wears off in a few hours.