Multiple reasons:
– Extremely cheap. We are talking about less than a $ per kilogram here.
– Relatively neutral pH, so not attacking permanent things.
– Can still act basic and somewhat acidic to attack simple residues.
– Produces CO2 gas with acids (vinegar/acetic acid in particular, another common cleaning agent), thus creating foam, stimulation and other effects that help with cleaning.
– Acts as an abrasive powder.
However, I tend to use it only rarely for cleaning, more often for neutralizing stuff. Modern household cleaners from supermarkets are cheap enough and often easier to use.
Edit: forgot the abrasive properties.
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