There are many soleplate cleaners at Retail stores. If yours is a standard plain soleplate (No Teflon or coating), you can use a 1200 grade wet and dry paper to clean it. Don't sand if its got the Teflon or coated plate as it will destroy it. Hardware stores carry the wet and dry. 1200 grade is very smooth for fine sanding.
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There are many soleplate cleaners at Retail stores. If yours is a standard plain soleplate (No Teflon or coating), you can use a 1200 grade wet and dry paper to clean it. Don't sand if its got the Teflon or coated plate as it will destroy it. Hardware stores carry the wet and dry. 1200 grade is very smooth for fine sanding.