Neem Oil - to rinse or not to rinse?

So, I have seen two schools of thought when using neem oil. One says to spray and leave, while the other says to spray then rinse. Which is right? Anybody that actually uses neem oil that has had success either way?

spray and leave just dont over do it and do it at night

anybody...?

I've never rinsed it off. Neves had any issues.

Spray it and leave it, don't over do it when spraying and time the sprays out.

spray it and leave its how i do it, i dont put any on after last week september, 5 weeks till harvest date (end october). you no its a naturel made from the NEEM plant!

Just sprayed my plants today, I do it about every 2 weeks. I spray the tops and bottoms of the leaves and lightly spray the soil under the plant. Knock on wood, never had any infestations or insect problems. It doesn't do shit for slugs though...I had to use organic iron phosphate pellets to kill them sons a bitches, that shit works.