Clear flower residue in a vase Once your beautiful bouquet is gone, the souvenir it leaves behind is not the kind of reminder you want: deposits of minerals on the vase interior. Reach inside the vase, rub the offending ring of deposits with salt, then wash with soapy water. If your hand won't fit inside, fill the vase with a strong solution of salt and water, shake it or brush gently with a bottle brush, then wash. This should clear away the residue.
Clean artificial flowers
You can quickly freshen up artificial flowers -- whether they are authentic silk ones or the more common nylon variety -- by placing them in a paper bag with 1/4 cup salt. Give the bag a few gentle shakes, and your flowers will emerge as clean as the day you bought them.