I make my own saline, capsaicin nasal spray/wash that really helps clear the sinus congestion. I use my very finely ground super hot pepper powder for this, you have to work out just how much salt (sea salt) and pepper powder you can use without having your nose burnt off . A tiny bit of powder and salt goes a long way, and even then it takes some time to get use to it first few uses it usually burns some, if you get to much hot pepper powder you will know it, also I make it fresh each time.
I have heard of people snorting the powder straight, but I would not recommend this unless you want to fry your sinus and brain.
I use my powder on just about everything and find that i have fewer if any colds while using it, I also use a lot of fresh super hots in most of my food although I just use small amounts.