Great question — answering as the UphillTech team:
The two products have some commonality of use but a different focus. Both have their place. Soap is good for many things. Sanitiser is an excellent companion when squatty toilets or dead animals in your water supply must be dealt with - read on ... Soap is used (as I know, you know) for cleaning - it removes contaminants that are hard or essentially impossible to remove by rubbing or scraping or by use of water alone. It essentially must have water to work and it needs water to rinse it away after it has done its job. It's use as a sanitiser is important but a secondary result of its main role. ie by removing material from your hands (or clothes or elsewhere) it also removes contaminants...
Full answer by ATCSVOL: https://outdoors.stackexchange.com/a/4033 (CC BY-SA 3.0).
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