Quick way to remove solidify thickness I have made the mesh and added solidify modifier and applied. But later i thought to increase the thickness. So now i want to remove thickness so that i can added the solidify modifier again. I want to know is there any quick remove thicknes. When i select the edge then ctrl+ the selection goes downward not to single face. So i want to know a quick way to decrease thickness. Any suggestion or help.
You will need to manually select the edge loops around the boundary, still using the alt-click to select them in vertex select mode until they are all selected. Then you will need to change to face select mode, and delete the faces. Then you will need to select a face on the surface you want to delete  and press L to select all linked faces  and then delete them, leaving your original surface ready for editing.