Final answer:
Washing insulators should start at the top and work down.
Step-by-step explanation:
True.
Washing insulators should start at the top and work down. This is because water and contaminants tend to flow downward due to gravity, so by starting at the top, you ensure that any dirt or residue is washed away completely. If you start at the bottom, the water and dirt from higher up will flow down and potentially leave behind dirt streaks or residue.
For example, if you are washing the insulators on a power line tower, you would start with the highest insulator and work your way down to the lowest one.