Unless your body cleanser is of a natural or pure botanical source, chances are it is packed with 20 to 30 man-made chemicals, including fragrance. In order to remain thick, coloured and perfumed, a typical shower wash/gel must contain at least 20 chemicals - a mixture of synthetic and a small amount derived from plants. It will also contain detergents, a blend of aroma, salt for thickening, glycerin and preservatives. Most of the plant extracts used have very little practical purposes and are just for clever marketing so the product can have fancy names and tag lines.
While we are on the topic of glycerin, it helps to know that due to the high content of this super moisturising liquid, natural soap tends to dissolve quicker when in constant contact with water and produces a layer of gel after use. For this reason, dry your natural soap out between use and do not leave it sitting in a damp shower or a pool of water. If you use soap everyday, consider 2 or 3 bars of your favourites and rotate them every second day. And there, you now have a luxury bath spa.