Brake or Carb cleaner is good for DRT RFN applications on various arthropods. As in one second flat.
Insects and spiders, most terrestrial arthropods with chitin exoskeletons make use of natural waxes/oils/fats to maintain body integrity, waterproof their insides in, and to keep the outside world out. Aggressive solvents melt/strip all these lipids away instantly, and pretty much all their organs and body structures fail at once.
D-Limonene, which is the stuff found in citrus peels, and is actually used as a food flavoring, is really good for a non-toxic indoor direct application version for use around pets or food.