I FORGOT THIS ONE

Holy water burns like hell if you have demon blood. No touch, very bad. Doesn't affect any creature with no demon blood.

How to get rid of a pesky spirit? Salt and pure iron can temporarily send spirits back to the spirit realm.

How to trap an angel? Either bind its wings or create a circle of holy oil and trap the angel by lighting the oil on fire

Curtesy of the tv show Supernatural ^_^