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you toss a dunk on their roof.

Or a small amount of diesel fuel (the dunks are safer). People sometimes do this with abandoned pools.

What does diesel do? Does the layer of oil prevent mosquitos from laying eggs?

Larvacidal oils block them from being able to breathe at the surface of the water.

Or mosquito bits

Mosquito bits and dunks are the same thing ya? Just slightly different form factor?

Yes

Mosquito dunks are the "time release" version and last 3-4 weeks, mosquito bits need to be added every 3-4 days.