Hey. Im a first year engineering student, and currently working on a design project. Part of the project requires me to investigate the effect of certain water contaminants on the effectiveness of clothes washing detergents. I am dealing mainly with water sources in Cambodia, so i am looking at things such as magnesium, arsenic, E coli etc. I did highschool chemistry so have a basic understanding of soaps and detergents, but i will need to do a bit more reading. Does anyone have any suggestions for sources which may have information about the effect of certain chemicals on the effectiveness of detergents? Thanks in advance, Dan.