You Can Use The Box Of Argo
For starching in your washing machine, and the results are vastly better than spray starching, also does not take as much time as you think with a little advance preparation.
Mix the Argo starch according to directions for "light", "medium or "heavy" starch. Take clean items, they can be dry or fresh from the spin cycle.
Set washing machine for final rinse and water level to "low" if only doing a few items. Let washer fill and start agitating, then pour in starch and allow to mix with water for a few minutes. Stop washer, add items you want starched, then reset timer so washer will agitate at least for five mins, maybe a bit longer. Then allow machine to spin dry. If your washer has spray rinses after the final rinse, they must be skipped or stopped as they will dilute the starch.
When machine is done, take items out, give them a good shake and hang to almost dry, then iron. Keep a spray bottle filled with water handy to moisten areas that may dry before you can get them ironed.
If you are not going to be doing a load of laundry within the next several hours, run the rinse cycle again (set washer to one level higher than you had it for starching, or "high" if that is what you used, and let it complete the cycle. You want to rinse any remaining starch out of the washing machine and pump to prevent mould from growing. Starch is a great food for molds and mildew (ever see bread that has hung around too long in damp and dark conditions?), so the machine has to be cleaned out after a starching cycle.
While it is possible to make "spray starch" from powdered starches, I've never been able to get the stuff to work without making a mess of things.
Faultess used to sell liquid starch in huge jugs one could find at K-Mart and other stores, but think they stopped sales to all but commercial laundries.
You can also try this:
http://www.cleanersupply.com/products/product.cfm?pID=2347