Duck 5 in 1 kills 99.99% of germs and helps to remove limescale from above and below the waterline. It keeps your toilet clean, fresh and limescale free. It is manufactured using renewable energy. With Duck's trademark bottleneck design it can easily reach right under the rim, giving your toilet a thorough hygienic clean with minimum effort. It has a marine fragrance which gives your bathroom a long lasting fresh scent.