Kev Ruaj Ntseg: Hlau railings yuav tsum tau ua kom ruaj ntseg kom ntseeg tau tias lawv muaj kev tiv thaiv.
Kev Kho Kom Zoo: Tsis tu ncua tshuaj xyuas qhov ruaj khov thiab qhov chaw ntawm cov railings, thiab kho tam sim txhua qhov xeb lossis puas.
Kev Xaiv Cov Khoom Siv: Xaiv cov khoom tsim nyog raws li ib puag ncig uas lawv yuav siv; Piv txwv li, cov ntaub ntawv uas muaj zog corrosion kuj yog pom zoo rau cov ntug hiav txwv dej.