Ngaphambi kokusetshenziswa, bheka ikepisi lokuhlinza ukuze uqinisekise isimo sokuphepha futhi ikakhulukazi ukuthi lisesimweni esiphelele, lihlanzekile futhi alilimalanga. Uma isivalo sokuhlinza singaphelele (umonakalo obonakalayo njengokungaguquki, amakhefu, ama-smudges)