|I have tried everything from soap to other plants and I can't get rid of them.|
That is strange because if you spray them with a properly mixed soap and get the aphids wet it will kill them. More may arrive but generally this is not difficult to accomplish. There are other insecticides for aphids so you might want to try a pyrethin spray or perhaps contact your County Extension Office for a stronger suggestion. In most cases if you don't kill the aphid's natural enemies those predators keep them in control.