What Is The Proper Way For Me To Clean The Dried Mucus Out Of My Nose 3 Weeks Post-Op?

I would recommend that you call your surgeon. It is probably a good idea to be seen to make sure that everything is going well. A vaporizer can help to put extra moisture in the air while you sleep. 

I recommend keeping the nasal mucosa moist and the nostril area clean. You can buy OTC saline spray and use it many times a day--you cannot over use this. This is a good way to keep the mucosa moist, and help soften any crusting in the nasal cavity. Additionally, a room humidifier can help. I ask my patients to use a qtip with hydrogen peroxide to keep the incisions (just inside to nose) clean and clear out any crusting. At 18d post op, the need to clean the nose with a q tip should be less than in the immediate post op period. You likely did not harm anything, but if you are concerned, please see your surgeon.