| 摘要 |
PROBLEM TO BE SOLVED: To obtain a sponge containing an abrasive material for easily cleaning stains such as fur and the like stuck on an automobile without damaging a coated surface. SOLUTION: The sponge containing an abrasive material is obtained by incorporating a pore-forming agent, an acetalizing agent and an acid catalyst into a polyvinyl alcohol aqueous solution, and further admixing therewith plate- like abrasive grains having an average particle size of 2-7μm exhibiting abrasive effects, casting the resultant solution, solidifying it to an appropriate degree, casting thereon a sponge-forming liquid not containing abrasive grains, solidifying it and cleaning the resultant sponge.
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