hi peeps, help me out here, i just found out this morning na may hard water stains yung front windshield ng car ko (color white)...sa tingin ko nakuha ko ito sa tulo ng aircon yesterday night... , ngayon i use water to remove it, ayaw matangal, i use rubbing compound, natangal ,pero konti lang.... what is the effective way to remove it? or ndi na talaga ito matatangal unless replace ko yung windshield?...anyone of you peeps have experienced this?