To remove marks caused by a clamp or another tool that damaged the wood surface in a project, you can follow these steps:

1. Dampen a white cloth or a paper towel folded 4 times with water.
2. Apply the damp cloth or paper towel to the mark you wish to remove.
3. Take a very hot iron and pass it over the cloth or paper several times.
4. The heat and steam produced by the iron will raise the wood fibers, causing the mark to disappear instantly.
5. If the mark is severe, repeat the process as needed.

Finally, even out the surface by sanding the wood.