Riz, Rice is a great first aid, but it does not prevent corrosion. I strongly suggest that you disassemble your phone, check [guide|6449|this teardown] to help you with that. Clean all your parts properly with some 90%+ isopropyl alcohol, including all the connectors and cable ends. Check for any missing, loose or charred looking components. After it is properly cleaned, '''replace the battery''' and reassemble. Re-evaluate for any damage. Hope this helps, good luck.