4 in 1 crevice cleaning brushes are used to carry out heavy-duty cleaning tasks in the kitchen, and bathroom, they are also used to clean floors. Not only that, they are indispensable in cleaning hard-to-reach areas like bottles, sprouts, refrigerator coils, and much more. this 4 in 1 crevice cleaning brush is a Durable nylon scrubbing bristles that easily cleans narrow spaces where dirt builds up. it also has Firm Bristles Brush Great for grout, window grooves, sinks, shower door tracks, tiles, and more. Small Crevice Brush Ideal for bottles, keyboards, lids, and other tight spaces.