Hi Welcome to the forum.
You don’t say how you cleaned the phone, did you dismantle it and to what degree.
There are water indicators in the phone, if any of these have gone from white to red you will not get a repair under warranty.
So how much coffee and was it just on the surface etc, the back, did you have a case. It’s difficult to understand with such little info your provide.
Black coffee, white, with or without sugar, each type will have different impact.
Sugar needs more water etc to wash away, milk will require ideally isopropyl alcohol etc.
Water indicators
Repair costs