Those bags with silica gel are also good dessicants, plus some forms of road salt. (the ordinary natrium chloride is not much effective, but magnesium chloride and calsium chloride is extremely effective).

If the phone has been lost in salty water, it's important to flush it thoroughly in fresh water before drying.

It may be important to screw the telephone completely apart, I lost my telephone in salty water, did my best to rinse it and dry it, but for no help. When I tried to screw it up some weeks later I discovered it was lots of corrosion inside.

The last tip - never give up. I heard someone lost their phone in water, did their best til rinse and dry, but ... alas, for no help. Half a year later by chance the owner tried to turn on the phone - and it worked!