You might want to have a look at this article on iFixIT regarding Water Damage. Please read the second part on “Cleaning Circuit Boards” carefully. And then come again with doing this (i.e.; just to begin with: “Completely disassemble your device removing all cables, opening all connectors and remove shields to access under them.”) for free.
Plus, while the cleaning/repair might seem to have been a successful one, the device might fail some time sooner or later due to the water damage/oxidation. And if the repair would be successful, you would still have to tell the customer, that the phone might fail later again, but that the bill now is for 2 working hours plus parts’n’stuff plus tax, postage and packaging, making it as expensive as a new core module (though this is just wild guesswork on my behalf).
No company, especially not a small one can really afford that kind of policy. Even more so, as water damage is in general on the user.
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