Cleaning supplies are the reason under sink cabinets get ugly. Bottles are different heights, sprays tip over, and the brush you want is always behind the one you don't. The right storage depends less on your cabinet and more on what you own, so start there.
If it's mostly spray bottles
Sprays are tall and top-heavy, which means they need floor space and a wall behind them — not a shelf that cuts the cabinet in half. Keep the cabinet floor open on one side of the pipe for sprays standing upright, and put the shelf on the other side. A height-adjustable shelf lets you set that clearance to the tallest bottle you own instead of guessing.
If it's sponges, gloves, and cloths
Small soft items disappear in deep bins. They belong on the inside of the door where you can see all of them at once. The no-drill door back hanger ($23) hooks over a standard cabinet door and gives you two shallow tiers — no screws, no damage, which matters if you rent.
If it's a bucket, brushes, and refill jugs
Bulky items are why fixed shelving fails. You need something you can pull toward you, because reaching over a pipe into the back of a 20-inch-deep cabinet is how things get abandoned. The SinkFlex Pull-Out Organizer ($33 for two) slides out on its own base, so the back of the cabinet stays reachable.
If it's all of the above
Most kitchens are the "all of the above" case, and buying one piece at a time is how you end up with mismatched racks that don't share the same height. The 3-Piece Under Sink Bundle ($55) is the shortcut: expandable shelving, slide-out baskets, and a caddy for the handful of things you carry room to room.
One rule that beats any product
Everything under the sink should be something you use in that room. Furniture polish, car wax, and the second vacuum attachment go somewhere else. Once the cabinet only holds kitchen cleaning gear, it stops overflowing.
Not sure what fits your cabinet? Read the complete under sink organization guide or shop the full range.