1. A method for determining the effective cleaning of bath tissue, the method comprising the steps of: a. providing at least one pair of worn underwear; b. optionally, cutting the pair of worn underwear and laying it flat with the inside surface exposed; c. scanning an image of the exposed, inside surface of the underwear, the image including at least a portion of the underwear likely to have fecal staining; d. capturing with the image at least one color standard; e. selecting image points in areas of the scanned image visually appearing clean and areas of the scanned image visually appearing stained with fecal staining; f. optionally, convert Red, Green, Blue (RGB) color to L*a*b* color; g. utilizing analysis software to characterize other areas of the scanned image corresponding to image points having similar color to the image points selected as clean or stained with fecal staining; h. classifying the image, pixel by pixel, into defined portions of the underwear that are clean or stained with fecal staining; and i. calculating areas corresponding to portions of the underwear stained with fecal staining.