No magic bullet for thrips.
They come in waves, think of them as barbarian hordes that run, hit, and magically hide.
Here's the arsenal:
Spinosad is weapon 1 $$ (highly effective)
Cold Pressed Neem 2 $$ (broad activity)
Synthetic poison of your choice 3 $ (effective, somewhat deleterious)
beneficial insects 4 $$ (highly effective)
Met52 EC (effective, broad activity) $$$,
http://www.abim.ch/fileadmin/abim/do..._ABIM-2008.pdf)
Diatomaceous Earth $ pool-garden, $$ foodgrade (foodgrade all the way, best option, everyone dies, including you if enough gets into your lungs)
Traps (sentinel)
Offer flowers and douse them heavily.
A combination of weapons is required, otherwise they will not go away.
Thrips in large numbers are season-enders.