I use a lot of this product. I like it. It smells great. Before using I cut off all leaves/stems with the scale. It has been my experience that no bug spray will remove the pest all together, though it helps to reduce returns. Wash the plant as well. Remove any left over blemishes/scale, then spray. I will warn you that it is a strong spray and has wilted several of my leaves already. Definitely do not use it in the heat of the day. If possible I spray the plant, then return after about an hour and wash off the spray with the hose which reduces burning.

Thanks GardenHelp! :-)