Hi, I have an avocado and hibiscus (houseplants) that ends up with white flies on their leaves and translucent looking flies in their soil. I've used Neem, Earth's Ally 3 in 1 plant spray, a mix of water and rubbing alcohol, and I've even changed their soil. The bugs keep coming back but ONLY on those plants. There are other plants that I have nearby that have nothing of the sort. The hibiscus still blooms but has lost many leaves. How can I eradicate the problem? In the pictures included, I have fly circled in the soil, and some of the white flies I've caught on some sticky paper.