Find orphan packages:
pacman -Qdt
Remove them with:
pacman -Rns $(pacman -Qdtq)
Find explicit installed packages:
pacman -Qh
Find AUR packages:
pacman -Qm
Force remove a package:
pacman -Rdd perl-libwww
Find orphan packages:
pacman -Qdt
Remove them with:
pacman -Rns $(pacman -Qdtq)
Find explicit installed packages:
pacman -Qh
Find AUR packages:
pacman -Qm
Force remove a package:
pacman -Rdd perl-libwww