★★★★★
It stings less when you dilute the lemon juice (or lime) with distilled water. But, most people say it works better full strength.
It's very simple to do. Squeeze out one teaspoon of lemon or lime juice into a spoon. Close off one nostril with your finger and snort up the juice in the spoon in the other nostril. Right after you do this you will have the feeling that you snorted a “blow-fish” up in your head. The pain only last a minute or two.
It worked for me. Cleared up the sinuses immediately.
Video: Cure sinus infection lime juice home remedy
https://www.youtube.com/watch?v=6ZSkn6KbQdY
Video: Sinus infection (lime juice)
