Karen Logan’s book “Clean House, Clean Planet“ has this recipe for a homemade soft scrub:
1 &2/3 c. baking soda
1/2 c. liquid soap
1/2 c. water
2 tablespoons white vinegar
•stir liquid soap into baking soda
•add water and stir to be as smooth as possible
•add vinegar and stir again
•pour into squeeze bottle (you can use an old ketchup bottle or old cleaning bottle for this.