I prespray with Heavens best cleaner, but Mpower from theother channel works ok.
Asians, especially Chinese have a concept called "face" which most people have heard of , yet few of us westerners comprehend.
This is what happened to my mum when she lived in China a couple of years ago..
She went to the dentist for a check up , she needed more work , but was flying back a few days later to England for a holiday, she could see from his diary that the dentist was fully booked until she went, but she asked anyway. At this point ,the dentist had to fit her in otherwise he would have lost "face".
Another example of this is Saddam Hussein, even though he was in an untenable , impossible position, he could never have surrendered, and believed he would be victorious even when (literally) in a hole.
We can apply this in our favour when quoting jobs for people of this culture type, ASK the customer ,if they can accept the price, it works , they cannot lose face.