Getting rid of cochineal on ficus or laurels

To get rid of cochineal on ficus or laurels here's what you need :
For one volume of 10 liters of water, 5 spoonfuls of black soap, 5 spoonfuls of 90 alcohol, 5 spoonfuls of green clay and 2 spoonfuls of bicarbonate soda.
Spray this mixture on the cochineal, when it isn't sunny (ideally at night time) to avoid the leaves from burning.