Not sure how people use the neem, but it's best to use an emulsifier to mix it with water (like soap). If it's actually better than a common oil however, is debatable to me. What you need to do is have a decent concentration, otherwise it's kinda for nothing. You need at least 3%, preferably 4-5, and about 90% will die in one application.
Having to do it inside sure doesn't sound like fun though. How did they get there? Are you overwintering peppers?
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