Here's one of the most perfect cleaning tips to utilize a space that's seemingly destined to stay a jumbled mess. The under-sink cabinet can be an awkward place to stash your stuff because of the pipes—unless you use a shelf organizer specifically designed to fit around the under-sink plumbing. One of the best bathroom storage ideas, this shelf system doubles usable storage in the cabinet. Expandable from 15 to 25 inches, it fits under almost any sink; and with removable shelves, you can accommodate the pipes. To avoid frustration, finish tightening the screws after the shelving unit is in place; you may not be able to get it in if it's already all put together.