I grow outdoor and wash my buds even if I don't have a pest issue... I have pretty bad allergies, if I leave all the pollen, dust, dirt and other air pollutants, on my buds, I couldn't smoke my harvest on a bad year without having an allergy attack of sneezing, watering eyes and hacking. Just think how sticky fresh buds are, anything that floats by is gonna get stuck... they're literally designed to catch pollen... even if you don't have an infestation of bugs, I'd bet money there's still bugs stuck in your outdoor grow. Even if you don't have a PM issue, there's likely a spore here and there. I don't eat veg out of my garden without washing and I don't want to smoke any extra bad shit either lol... It also makes the smoke smoother. There's many methods. I do a peroxide water dunk followed by 2 clean water buckets. It does affect bag appeal slightly and you lose a few trichs... but for me, it's a necessary trade off.