Exel® Microfibre Cloth - Box of 20020 Packs of 10 Exel is our most popular knitted microfibre cloth, which is ideal for quick and effective cleaning. The ultra fine microfibres capture dirt from most surfaces, is designed to create a very large surface area per fibre and are naturally statically charged so that they have a strong suction effect. In other words, they collect as much dirt as possible in just one wipe, even from the smallest surface crevices.