Getting rid of scale bugs?

My "goldfish" plant has scales that it picked up from a rubber tree plant that someone gave to me. I got rid of the rubber plant and thought that the scale bugs were gone but they had transfered to this plant. I have tried taking all of them (that I can see) off and spraying them with a spray for scale bugs but nothing seems to completely eradicate them. Does any one have any suggestions of products they have used that have worked. Keep in mind, I have two cats in the house so I can't use anything that will hurt them. Thanks in advance!