Other than rice, try get some silicone gel, the type used with Thirsty Hippo or similar brands, put the phone in it for a week. Yeah, a week. Then get a tech to open it up to take out the battery.

My Nokia E6 was drenched in water for 15 min(laundry). I thought it was a goner. Memory card, sim card still worked. 2 weeks in silicone gel, hey presto, came back to life, the touchscreen still responsive. Only the battery was gone.