Step 1: Material's
1. Strong magnet (preferably neodymium)
2. Plastic bag, paper, etc.
Step 2: Assembly & Clean Up
Put the magnet in the bag ( make sure bag is inside out) or fold paper around magnet.
Then put magnet over the filings.
Step 3: Discard
Flip bag inside out and throw away. Or toss the paper in the garbage.