sudo pacman -Sc
sudo pacman -Scc
sudo pacman -Qtdq
TIP: use
sudo pacman -R {}
to remove a single package
sudo pacman -R $(pacman -Qtdq)
TIP: see package not instaled from arch package repo,
sudo pacman -Qm
rm -rf .cache
TIP: use program
ncdu
to check store per folder