Why are the screen colors abnormal on my LG Optimus L7 II?

Please help! My phone LG Optimus L7 II. I was sprayed on the screen water, then erased. phone used and everything was good, but then I saw that between the phone and case water. So I removed water, opened phone case, and I saw little water. Then I have turned off phone, taked out battery, cleaned and turned on. Then, after 2 hours screen had some black lines, some white and booting LG word colors go up and down. I putted it to rice. but it didin't helped. So what can i do? Please help?!