When evaluating escalator cleaners, prioritize cleaning width (typically 350mm to 520mm) to ensure compatibility with standard step sizes. Look for machines with dual-brush systems (nylon or Tynex) that can reach deep into the grooves of the steps. A critical feature is the vacuum suction power (measured in kPa); high suction ensures that no water or debris is left in the mechanism, preventing internal corrosion. Additionally, ensure the unit has adjustable height settings to accommodate different escalator brands like Otis, Schindler, or Kone.