... and dust before application.2.Shake container vigorously for 2 minuters before use, make sure liquid mix ... 30cm away from surface,adjust nozzle, press downward valve with index finger to spray evenly.5.Please ... , and press the valve for 3 seconds, then clean the residue of the valve, keep the valve not being block. ... the time goes, if any, it’s normal for this products, wastage rate is less than 2% ...