Here's how we do it - and we own three dutch ovens, 5 frying pans, a griddle and a small oval frying pan.
Wash your new cast iron items in hot soapy water to remove any oils from manufacturing. Dry thoroughly. Coat the entire surface - inside and out - with a good coat of vegetable oil. Dont' forget your cover! Turn your gas grill on and set your items inside your grill and leave them there for a couple of hours. Periodically check your items and add more il if you see any dry spots. When you're done, let everything cool, then wipe down with a cloth or paper towel. You could also do this in your oven, but be forwarned - it will get smoky in your house!!
If you still have problems with foods sticking, repeat this process. I NEVER use soap of any kind in my cast iron after seasoning. Simply wipe it out or if you have something sticky and gooey, I add water to the pan and simmer until the gunk comes off. Then dump it out, wipe it out and you're done!
To protect your cast iron, and to keep it seasoned, I use commercial Cast Iron Conditioner once in a while, especially when stowing these items in the fall. I don't use any type of vegetable oil for this process, as it can turn rancid and sticky. Only Cast Iron Conditioner. You can find it at Cabela's or any good sporting goods store.
I grew up using cast iron and if it weren't so heavy, and if I weren't so paranoid of scratching my glass cooktop, I'd use it every day at home.
2012 Rockwood 8293RKSS
2006 Dodge Ram 2500 5.9L Cummins Turbodiesel 4x4; 2012 Ford Escape 4x4. 3 very pampered cats.
Days camped: 2011: 61; 2012: 66 Days; 2013: 69;2014: 68 2015: 90 Days camped 2016: 34