I haven't had scale, nor have I tried it on sarrs, but Neem is safe to use on Nepenthes in my experience. I've used it on baby Judith Finn (and all the orchids) with no untoward effects. Good Luck, Bob

http://www.bayeradvanced.com/product/Tree-Shrub-Insect-Control/concentrate.html

1 Tbs per gallon, problem solved. The only thing to keep in mind is that I don't think it works on red spider mites.

I'm sure malathion will kill them on contact. I have used that on my nepenthes for scale just a few months ago.

Generally speaking, it is suggested that oils are avoided on CPs.