when do you consider a famicom cart "dead"?

[arcadifvid]

i recently bought a bulk of famicom carts online. The condition of the carts are really terrible but i could not resist some of the games. i cleaned them all up as much as i can but a handful would not load no matter what i do (white screen, black screen nothing) i tried using different consoles but no luck. i'm close to giving up. the contacts are clean, maybe it could still load but when do you consider a cart "dead" hopeless other than seeing physical abuse off course.
and what do you guys do with the carts that are dead? garbage bin? display?

[Fragems]

What have you cleaned the contacts with and have you opened any of them up to see what condition the boards are in?

[TSTR]

When it's sacced for a repro.