Frequent question: How do I remove all textures in blender?

Yes, you can. Easy way would be: Select all objects, keep one active, remove all materials on it by pressing the “-” button on the right-hand side of material slot list; Then, from the drop-down list (below it), choose Copy Material to Others.

How do you find a hole in a Mesh blender?

Shift+M* selects all Non-manifold edges/vertices (holes) in a mesh **.

How do you clean up Mesh?

You can simply invoke the command found in the menu bar under Geometry > Mesh Cleanup to open the Mesh Cleanup dialog. You can then toggle the different options on or off, if applicable, and press OK to apply the command to the currently-selected geometry.