It's import to get the right castor oil. The best option would be organic, cold pressed, hexane-free castor oil or if not organic, make sure it is at least cold pressed and hexane free - like this one.  For mess free application I like to use a castor oil roll-on!  Options for making the pack are a cotton flannel or an undyed, plain white cotton t- shirt or purchase a castor oil pack like this one.   It doesn't have to be fancy!

Next, up if you have the castor oil roll-on, cover the liver (about a 4" x 6" area ) on your right hand side, just under your rib cage.  If you have the liquid castor oil, just place about 2 tablespoons of castor oil drizzled over the pack.  
You can, if you are afraid of leaks, use an old towel over the castor oil pack protect your clothes and bedding.   Castor oil can be messy and is incredibly hard to get out of anything!  (Think motor oil! 😆)  I have one client that uses a puppy pad for protection and sometimes she even uses one of those to make a castor oil pack! 
Now, find a comfy spot and place the pack over your liver area with or without heat.  It's debatable as to whether or not the application of heat makes it more effective.  You can use a hot water bottle or if not EMF sensitive, a heating pad.   You want to relax for about an hour wearing your castor oil pack or some will be so comfy, they will sleep with it on!  Personal choice here!  You can also start slowly, maybe doing 10-20 mins. for your first time.  

For best results use 3-4 days a week consecutively. The more consistent you are with them, the more benefit you will get! You can rotate the packs around too- liver, adrenals/kidneys, thyroid, and even the colon if you have constipation. Some do use them daily. There are two times when I suggest NOT using a castor oil pack - 1. when menstruating (wait until bleeding stops) and 2. when pregnant. 

Most of the castor oil will be absorbed but if when you are finished you have some residue, you can just wipe it off with another cloth or paper towel.  You can keep the pack in a sealed jar/bag and add a little more oil each time you use it.  After few weeks of using it, you can wash it with a ton of baking soda and hot water - I suggest doing this in your sink or a bucket a few times and then throw it in the washing machine by itself.  I can use my pack for almost 2-3 months before I need to think about washing it.  

These are great for kids, teenagers, and men too!!  Very often I see teenage hormonal acne helped by castor oil packing regularly. I personally can vouch for the effectiveness on managing estrogen dominance - so common in women!  Such a simple detox method with so many advantages!