Review (4/5): This stuff smells terrible! Bugs Hate It
...and thats exactly what its supposed to smell like. God this stuff is terrible, but the bugs hate it and I hate bugs more than I hate neem.
Use it as a preventative. Less effective to get rid of established pest populations. Be careful on foliar sprays and root feeds to not over-do it. Neem will burn/kill your plant if too much. Do not spray while the sun is out/lights are on. Early morning or lower indoor intensity for best results.
Use a Lactobacillus culture to prevent mildews if spraying is causing overly-moist conditions.