Tell your friend to replace them.Is there anyway to make em playable again

Why "apart" from the toothpaste thing ?
Did it not work?
Most DVD rental shops do it for a few quid, always done a decent job of it when I've gone in with PS3 and PS2 games in the past.
go back in time
In the past, I've ripped the contents of a dvd to desktop when it no longer plays (skipping). Might be worth a go