I find these little gems wonderful to clean the toilet with and without the harsh of chemicals.
Here is a general recipe.
1/2 Cup baking soda
1/2 Cup citric acid
1/2 Cup corn starch
25 drops of essential oils
Mix all ingredients together, if not moist enough spray a little water on the mixture.
Spray molds with water pour mixture into molds and let stand for over night. After they are set up put in freezer bags.