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How to make homemade laundry spray starch with cornstarch
Fill a jar with the water.
To make the starch spray, you'll need a jar with a lid that is larger than a pint (473 ml). Open the jar, and add 1 pint of distilled warm water.
You can make the spray in a bowl if you prefer. However, you'll have to mix it by hand rather than shake it to combine the ingredients.