1 table spoon of bleach to 1 galon of water, and use a pulverizer.
Alcohol and water, you can find proportions from 1/9 to 1/1 but its ultimately up to you to choose what you think its best, i would say 1/3 seems like a legit guesswork so if ur going with the alcohol and water u should follow that.
And the good ol neem oil, mix with water and spray it.
You can also go with "Diatomaceous Earth"
Insecticidal soap
Azamax
Spinosad
And if none of the above gets the job done (highly unlikely to not get the job done) you can always go with floramite (only as a last resource terminator type deal)