After fixing up the 300 m² roof of the farmhouse, we collected about 600 g scrap metal in the grass around the house.
By walking up and down the lawn, we picked up rusty nails and screws, nail heads, hooks, pieces of wire, horseshoes and much more - all in all 221 individual pieces that can no long threaten our car tires or feet.
Financial cost and labor effort were well balanced.
There might be more metal pieces deeper in the ground, but they don't bother us.
Maybe we start a follow-up mission and catch some more.