Answer:
The water would not completely clean out your nose, but it would partially remove some mucus and dust particles from your nasal cavities. This may be harmful to your body, as dust and mucus settle in the nose so that your body can expel them. Dust entering your body may repress your lungs, or cause problems in your digestive system. Instead of drinking water through your nose, I suggest blowing your nose to remove all the nasties.
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