I'm surprised by all the bad info you've been given on this.
The best way to drain your nose is to wait until the most innappropriate moment to let it come gushing out, like when you are with your girlfriend or whoever else you really want to impress.
LIttle kids are usually fascinated by the quantity of fluid your sinuses can hold.
Otherwise......you'll never find anyone who understands what all that stuff is coming out of your nose.
But at least there's some entertainment value to be gained, so make the most of it.......