Hi :) I tried a mixture of alcool (400cc), Marseille soap (50 grazie) and water (200cc). You grind the soap and dilute it in hot water (don't put water+soap in the microwave I tried and it blew up lol). Then you let it cool a but and add the alcool. Spray it on the leaves (especially under the leaves) and on the stems but don't touch the buds. Treat in early morning/late evening. You may need a few applications to get rid of them. Ah yes, it may leave white soapy residues but it's no big deal.
You could also try a very smelly garlic tea (just boil some cloves) or, if you have access to a field, some nettle tea (it smells so bad you'll want to die but it's almost magical). Good luck :)