Continue writing the next sentence in this paragraph:

How to clean aluminum gutters
Lean the ladder against the gutters near a nail.
Locate a place on the gutters where a nail holds them to the house. It is best to place the ladder here because the gutter is supported best at the nails.
If you place the ladder farther from a nail, the gutter is weaker and may crash. If you can lean the ladder against the house's main structure rather than the gutters, do this to entirely avoid leaning on the gutters.