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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.
I used regular bar soap and warm water to clean it, since i'm out of antibacterial hand soap. The only other thing i have is an out dated bottle... Yes, it's completely safe. The only thing that happens is that as time goes on some of the hydrogen peroxide breaks down into water. Essentially, it is just diluted hydrogen peroxide, but it should be fine for the time being. If the peroxide bubbles slightly when it hits the wound, then it's still doing its job. Warm water and soap is the best treatment to clean it out. If it's been a couple of days and the wound is infected, then triple antibiotic cream can help.