Insects breathe through tiny pores in their skin. If those get wet,
they suffocate. Spraying upwards kills them that way. I've found it
very effective, infestations of black & greenfly are knocked out in
one go. I can't remember whether I've used it on red spider mites.


NT


Blackfly and greenfly are easy to dislodge by spraying in any direction
, but that is not "most bugs"