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In poor areas，water is not clean,and the container of water is not clean,too.Because the brush part is soft like a rubber ball,it can change shape easily,can clean almost every area.As a result of pressing,the gas in the hose be pressed down to the ball,and when loosen the grip,as a result of atmos,the gas in the ball will be pressed back to the hose.The brush part is a layer of soft plastic,so before air filling process,it can through a narrow-mouth,even we can use our finger to help it to get in the vacuum flasks,and then inflate to make it bigger to brush.