Not a good idea! Soap contains microscopic undissolveable solids which can leave a scum on the film.
Ask anyone who has to clean a bathroom basin. I noticed this when I started to use shower gel instead of soap, the shower didn't need cleaning nearly so often. I still use soap in the hand basin and that needs cleaning more or less daily.
Even washing up liquid is not good. That contains a high concentration of salt.
A bottle of wetting agent although it has a 'use by date' can largely be ignored and will last for a very long time.
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