People in SE Asia don't eat with their hands, you must be thinking about Central/South Asia. Spray cleaning really isn't that bad, you should be washing your hands after anyways.
Genuinely curious.
Nowadays many people are westernized enough that they have switched to eating w/ utensils (either chopsticks or fork/spoon, depending on type of cuisine, and the Chinese segment of the population have been using chopsticks all along), but eating with the hands is still quite common.
The houses where I've spent time in Malaysia had western toilets but often with a bucket & cup or sprayer for cleaning; toilet paper sometimes also present, but not always.