Cleaning sponge and cleaning method

Abstract

A sponge roller is made of a polyvinyl acetal porous resin material having elasticity in a wet state, includes a roller in an approximate cylinder form and a plurality of protrusions formed integrally on an outer peripheral surface of the roller, and rotates the multiple protrusions to make contact with a surface to be cleaned so as to clean the surface. The polyvinyl acetal porous resin material constituting the sponge roller contains a cationic functional group.

What is claimed is: 
     
         1 . A cleaning sponge, which is made of a polyvinyl acetal porous resin material having elasticity in a wet state and is used to rub against a surface to be cleaned so as to clean the surface to be cleaned, wherein
 the polyvinyl acetal porous resin material comprises a cationic functional group.   
     
     
         2 . The cleaning sponge according to  claim 1 , wherein the cationic functional group includes at least one of an amino group, an imino group, and a biguanide group. 
     
     
         3 . The cleaning sponge according to either  claim 1 , wherein the polyvinyl acetal porous resin material has a positive zeta potential under a condition of pH 8 or less. 
     
     
         4 . The cleaning sponge according to  claim 1 , wherein the cleaning sponge has a roller form comprising an approximately cylindrical roller and multiple protrusions formed integrally on the outer surface of the roller, and the protrusions rotate and touch a surface to be cleaned so as to clean the surface. 
     
     
         5 . A cleaning method of scrub-cleaning using the cleaning sponge according to  claim 1 , wherein electrical and chemical adsorption or repulsion is utilized in the scrub cleaning. 
     
     
         6 . A cleaning method of scrub cleaning in an environment of pH 8 or less (under conditions on the mildly alkaline to acidic side) using the cleaning sponge according to  claim 1 .