When I started snuffing I thought all sorts of nasal hygiene would be necessary. I just blow my nose a few times through the day, and in the mornings load with menthol before getting on the shower for a real thorough blow. On real heavy snuff sessions yeah I might grab a big ball from the front of each nostril - I have a fancy dish for that 
In 7 months of constant snuffing I havent had to use a netipot. Would probably be nice, just not a requirement. Personally I stay away from smokey snuffs because, though I enjoy several of them, I find they hurt my sense of smell. Maybe like Sam says if I flushed afterward it wouldn’t be an issue. As for how long flavors last, there are a Lot of variables. Top of mind is your environment - if your inside all day try taking a walk outside and the scent of the snuffs in your nose will open up in new ways.
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