Is one allowed to drink the juices which oozed out during eating; grapefruit issues.
Using bottle caps, boxes, packages with lettering, numbers, or pictures on them.
Sprinkling Water on a Carpet. Asking a Non-Jew to Wash Your Floors;
Various important examples which come up on Shabbos in conjunction with the halachas of perfuming or putting in a nice smell into an item;