What's the difference between Shower Gel and Body Wash?

I got one of those holiday gift baskets and it has both. What's the difference?
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Technically, a vast majority of "soaps" on the market aren't actually soap; they're detergent. Anytime you see an ingredient that sounds anything remotely like "sodium laryl sulfate", you're looking at a detergent. True soap is only made with lye and fat, which will be listed as "saponified oils". The difference between shower gel, most soap, and body wash is consistency and targeted marketing.
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