A sponge having at least one porous layer and at least one scouring layer, wherein the sponge has at least one cavity distinct from the pores of the sponge and emerging on a surface of the scouring layer forming an opening, and characterized in that at least one layer among the porous layer and the scouring layer has a foam generating speed of less than 12 pressures, the foam generating speed being measured by the following method: - Providing a test sample of 90mm*40mm*40mm of material, - Pre-treating the sample: ▪ Squeezing sample under water having a hardness of about 290 mg/L (29°fH) 3 times and letting it in water for 3 minutes, ▪ Taking the sample out of water and wringing it manually, ▪ Drying the sponge, - Impregnating the pre-treated test sample uniformly with 14.5g of water, - Putting 0.5g of detergent in the centre of one of the 90x40 mm sides of the test sample, the detergent having a Brookfield viscosity ranging from 900 to 1000 mPa.s measured with a spindle L1 at 1.5 rpm at a temperature of 20°C and a foam capacity ranging from 140 to 170 mL according to standard ISO 696:1975, - Letting the detergent impregnate the test sample for 30 seconds, - Placing the test sample into a holding and compression device on one of its 90 x 40 mm sides, the side used for the detergent impregnation is set perpendicularly to the base of the device, - Placing a graduated collector under the bottom plate of the device to collect the foam ejected at each compression, - Compressing sample several times at a speed of 220 mm/s, stopping compression when the applied strength reaches 3.5 kg and respecting a stop time between each compression of 7 seconds; after each compression the foam present under the sponge is collected by scrapping it into a collector, and measuring cumulated foam volume collected, excluding water present in the bottom of collector, after each compression, - Stop process when cumulated foam volume collected, excluding water collected at the bottom of the collector, has reached or exceeded 25ml, the foam generation speed being expressed by the number of compressions performed till collection of 25 ml foam, the final result being the average of 5 measures. - Providing a test sample of 90mm*40mm*40mm of material, - Pre-treating the sample: ▪ Squeezing sample under water having a hardness of about 290 mg/L (29°fH) 3 times and letting it in water for 3 minutes, ▪ Taking the sample out of water and wringing it manually, ▪ Drying the sponge, ▪ Squeezing sample under water having a hardness of about 290 mg/L (29°fH) 3 times and letting it in water for 3 minutes, ▪ Taking the sample out of water and wringing it manually, ▪ Drying the sponge, - Impregnating the pre-treated test sample uniformly with 14.5g of water, - Putting 0.5g of detergent in the centre of one of the 90x40 mm sides of the test sample, the detergent having a Brookfield viscosity ranging from 900 to 1000 mPa.s measured with a spindle L1 at 1.5 rpm at a temperature of 20°C and a foam capacity ranging from 140 to 170 mL according to standard ISO 696:1975, - Letting the detergent impregnate the test sample for 30 seconds, - Placing the test sample into a holding and compression device on one of its 90 x 40 mm sides, the side used for the detergent impregnation is set perpendicularly to the base of the device, - Placing a graduated collector under the bottom plate of the device to collect the foam ejected at each compression, - Compressing sample several times at a speed of 220 mm/s, stopping compression when the applied strength reaches 3.5 kg and respecting a stop time between each compression of 7 seconds; after each compression the foam present under the sponge is collected by scrapping it into a collector, and measuring cumulated foam volume collected, excluding water present in the bottom of collector, after each compression, - Stop process when cumulated foam volume collected, excluding water collected at the bottom of the collector, has reached or exceeded 25ml, the foam generation speed being expressed by the number of compressions performed till collection of 25 ml foam, the final result being the average of 5 measures.