Detergent, cleaning and other similar sprays are often missing in the times of need. Getting specific shelves for the same may not be economically viable always too. Here's a cheap tip that will allow for better organization and space conservation.
Under the sink/wash basin; you might have a cabinet but it is filled with many other goods like detergent powder boxes and other items while the space above them is essentially empty. Ironically, you may not be able to make use of this space usually.
To fix this problem, try to get a tension rod fixed right beneath the sink across the walls. You can use the rod to hang bottles the ones pictured. Now you have all your bathroom supplies and cleaning supplies at one place. Never have to look around for them again. Handy ain't it?