TommyTrichome - Spinosed shouldn't be leaving any residue. I suspect you either got a bad batch/brand, or possibly didn't mix it good enough. I've only used Captain Jacks Dead Bug Concentrate, and it instantly killed every thrip in sight and had zero noticeable effect on the plants.
Spinosed is awesome because it works for all the bugs that neem doesn't. I wouldn't give up using it, but I do suggest changing brands.