Final answer:
The contaminant silicon in detergents can come from various sources including additives such as friction modifiers, EP & AW additives, and detergent additives.
Step-by-step explanation:
The contaminant silicon in detergents can come from sources such as dirt, but it can also come from friction modifiers, EP & AW additives, and detergent additives. These additives are used to enhance the performance of detergents, by modifying foaming properties, increasing or decreasing viscosity, preventing dyes from transferring, and preventing soil particles from reattaching. Additionally, detergents may contain surfactants which absorb and emulsify soil, reducing water's surface tension to improve wetting.