Im not to sure about your concoction, Im not saying it wont work but some components are too healthy for the plant

3 tabelspoons of Neem Oil , 5 drops of dish soap (to help the oil spread evenly) spray the plants , undersides of leaves in particular

this will take care of most all your insect mould and mildew issues

for a homemade solution
Steep 4 garlic cloves in 1 litre of boiled water for 24 hours. Strain.
Do not dilute add 5-8 drops of dishsoap. Spray on plants, no more than twice a week, this will keep most insects off the plants