What to do with the line someone left
Small pieces deserve more attention than their size suggests.
Collect only what you can handle safely
Loose fishing line is worth noticing, but hooks, unstable ground, and wildlife can make retrieval unsafe. Do not reach into a dangerous position to tidy a place. Where you cannot safely deal with something, use the relevant local reporting route or alert the site manager.
Contain what you remove
Put line and sharp items in a secure container rather than a pocket or an open bag. Keep children and animals away from collected hooks. Choose suitable disposal or recycling options available locally.
Make your own system easier
Bring a practical rubbish container and check the position before leaving. Account for the short offcuts as well as the obvious packaging. A habit at your own feet is a useful contribution even when you cannot repair everything you find.