This is mildly abrasive. To make it more abrasive, add additional whiting, a tablespoon at a time.

1/2 cup soap flakes or Soft Soap
2 teaspoons borax
1-1/2 cups hot water
2 to 5 teaspoons whiting

Mix soap flakes, borax and water in a large plastic bowl until soap and borax are dissolved. Add 2 to 5 teaspoons whiting, checking the consistency and degree of abrasiveness after each teaspoon. Pour into a squeeze-top container. Keep out of the reach of children.

To use, shake well. Squeeze some of the cleanser onto a sponge and wipe down the appliance or fiberglass. Rinse and dry. For heavily soiled areas, squeeze the cleanser directly onto the spot or stain and let it remain for 30 minutes. Scrub off, rinse, and repeat if necessary.