Fast kill is a no kill

I recently purchased the "fast kill" brand of insect spray which has a tag labelled instant killing action. I have a white walled bedroom so i can see the mosquitoes in particular relatively easily. From usage i have discovered anything short of drowning the insect with the spray is ineffective. when i switched to raid i found much greater joy. Definitely the worst insecticide I've ever used and probably a defective batch. It would be great to submit this can for testing.