Elizabeth line: How are TfL preventing dirty 'ghost' marks? - ÃÛÑ¿´«Ã½ Sounds

Elizabeth line: How are TfL preventing dirty 'ghost' marks? - ÃÛÑ¿´«Ã½ Sounds
Elizabeth line: How are TfL preventing dirty 'ghost' marks?
Posters are being put up behind platform benches after passengers left grease marks.