Never wash at petrol stations or those cheap places. They will just spray water directly to engine without cover.

There are some specialized shops that do engine bay cleaning. If can't find, do it at service center.

Edit: Last time my friend did it for RM80+ i think. Google engine bay wash and you will get the answer you want.

This post has been edited by ru40342: Jan 4 2021, 09:49 PM