●Use a sponge without wetting.
●Keep the sponge clean at any time since it becomes harder to put foundation on the sponge if it got dirt.
●When a sponge got dirty, wash it pressing lightly in lukewarm water with a small amount of neutral detergent dissolved. Use it again after draining off the water and drying it well in a shady area upon rinsing adequately to prevent the detergent from remaining.
●Iis recommended to replace the sponge when the usability got worse.