Heavy starch leaves your jeans extra stiff, making it ideal for those who prefer their denim unwrinkled. If you prefer to iron a crease in your jeans, heavy starch will help the crease stay sharp longer. Starch comes in several different forms, including spray and powder, but for heavy starching your jeans at home, liquid starch will give you the best results with the least effort. Get cowboy-stiff denim by using starch when washing as well as ironing.
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Wash your jeans by themselves in the washing machine with warm water and detergent. Set the machine for a small load.
Add liquid starch instead of fabric softener in the rinse cycle. Different brands require different amounts, so read the directions on the bottle. Most brands specify how much to add for light, medium and heavy starch.
Hang your jeans on a clothesline to dry.
Fill a spray bottle with more liquid starch. Do not dilute it. Lay your jeans on an ironing board and spray them until they are damp.
Iron your jeans with a hot iron on a non-steam setting.