Best place for degreaser is marriot rd karachi, they will have lots of different industrial degreaser, wont be cheap but they are highly concentrated and only 10% solution of it will cut grease easily
If you are a bit on the low cost side, proceed to botal galee in lighthouse area and ask the shops to make you a degreaser, they can blend it for you then and there. Make sure you understand exactly how to use it.
For super cheap solution get a bottle of ajax or lemon max liquid and use that mixed with water.
