If you clean it that way you might want to follow up the water/detergent with a shot of electronic parts cleaner to evaporate any water or residue that's sitting in there. Follow that with a sqirt of graphite for a dry lubricant. My opinion.

But replace the lock assembly at a minimum. If it fails and you can't turn the key, the tumbler (hardened steel) has to be drilled out.

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mjk

'84 300SD 119KMi (Liesl der Diesel)
'84 300D 326KMi when the oil left (former parts car)
'82 300SD 253KMi (new parts car)