The cleanup works best when it begins before the mat or tray leaves the work surface.
1. Fold inward
Bring the outer edges toward the center so loose mix stays inside the boundary.
2. Brush the edge
Use a soft hand brush to move remaining grains inward. Avoid sweeping soil into a sink unless local plumbing guidance allows it.
3. Wipe and dry
Empty debris appropriately, wipe the mat or tray, and let every damp component dry before compact storage.