Try asking in garden centers like Ace Harware shop etc. At least the staff there speaks english or Bahasa Malaysia.
Just try waterbase arosol first. It is safe for your plants and family too. I just use this as I am living in an apartment. Don't want poisonous substance to be on the leaves of my plants in the house.
Alternatively you can try some natural remedy in this
article but be careful with some of the substance as CPs might not take too well to them if the entire plant is subject to it.