Pressing—the process of applying pressure, with or without heat—and with or without humidity—in order to fully reverse, or reduce, the effects of paper damage. This process is considered non-restorative.
Defects that are fixable:

Wolvering 1 – back cover
* Non-color breaking creases

All-Star Western #10
* Bends
* Ripples / waviness

Amazing Spider-man #251
* Spine Roll

Amazing Spider-Man #361
* Dents

Amazing Spider-Man #121
* Impressions

Amazing Spider-Man #361
* Warped books
Defects that aren’t fixable:

Archie #14
* Stains

Amazing Spider-Man #121
* Color breaking creases
* writing
* color touch

comic book tear
* Tears

rusty staple
* Rusty staples
* color fading
* popped staples
Dry Cleaning—the process of removing dirt, grime, and some surface staining WITHOUT the use of solvents/chemicals/liquids.
Defects that aren’t fixable:

foxing
*Foxing
*ink
*Water stains