Edge brush

You won't get excited by this brush until you see what it does. AKA a joint brush, corner or crevice brush. Anyway, when you need one of these, NOTHING else will do. An old toothbrush will do most fiddly household cleaning jobs, but there are a few areas where that won't get right in there (like the hinges on toilets). See pics for best explanation. But it's flat so you get in really tight spaces where nothing else will reach.

22.5cm. Made with white nylon bristles.