sounds like you may have caused the leaves to burn by spraying soap on them every day for a week. the waxy cuticle is only so thick and once removed the plants have no protection from the light. homemade concoctions may be cheaper than store bought products but store bought come with directions for use and quality control. Eutrophication by the way is a term used when excess runoff creates Algae blooms in ponds. over fertilization is what we say in the Hort industry and i assume you are asking about. if you do have mites, check out the thread "no more spider mites on cannabis"