Aphids In Greenhouse

Is there anyone else experiencing an aphid infestation in their greenhouse? Last autumn, I transferred several pepper plants and an Ashwagandha plant into my greenhouse to extend the harvesting season. Prior to relocating them, I thoroughly rinsed the plants to eliminate as many pests as possible. However, it seems I did not remove all the aphids, as they persisted throughout the winter. Each time I water the plants — unless I resort to using the self-watering system while away — I make it a point to rinse the leaves in an effort to eliminate them. Unfortunately, new aphids appear by the next watering. I have also attempted to control the situation using a diluted Dawn soap solution, but this method has proven to be less effective than anticipated.  I’ve come across reports of people achieving good results with Neem Oil, so I plan to give it a try next. Additionally, I’ll consider applying Diatomaceous Earth and/or a peroxide solution to the soil to combat pests lurking below.

I’ll update everyone on which solutions prove to be most effective in my greenhouse.