Each product passed a series of stringent tests performed by an independent laboratory in order to make the list of cleaning solutions.
The tests for spot removers, pre-sprays and in-tank solutions include protocols for efficacy (removing stains), resoiling (whether the product attracts soil at an accelerated rate), pH (excessively acid or alkaline products can affect dyes and fibers), optical brighteners (can adversely affect color, appearance and performance) and colorfastness to light (residues on pile yarn can accelerate color change).