Yes... I have to agree... it's hard to find good information in a physical form on chakras.
With the Solar Plexus/Ego Center... personally, I would never raise the chakra into another chakra, especially for cleansing. When doing that, you run the risk of transition any issues from that chakra, into the other chakra, so now you have the issue in both Chakras.
The best way I have found with getting the "fear layer" out of it is by feeding the SP/EC with massive amounts of warm, strong yellow energy, and cycling out (down the hara line into the earth via the lower root or by expanding the chakra to outside of your personal shielding) the "fear layer". I personally see the "fear layer" as a bruised redness in the chakra. Remember, your SP/EC is the power house of the other chakras... the other chakras can draw on the energy (will energy) from the SP/EC via the Hara Line to have a boost or stabilization, though they will weaken if you don't have a strong SP/EC... and you will tire easier.
The SP/EC is best described as... the Ego Center... The Will Center... Personal Power Center, View of Self and your mindset/mood/personality affect how and what energy your SP/EC gives off. I.E. Have you ever noticed someone enter into a room... and they demand the attention of everyone in that room, or seems to carry themself very "strongly." This is b/c they have a strong (though may not be healthly) SP/EC. To ensure a healthy SP/EC, have it a solid, strong color (in this case, yellow).
Also, I do have a GREAT Chakra meditation for clearing and balancing chakras at:
http://education.psinergy.info/v3/Online_Manuals/HTML/Chakra_Meditiation.htmlHope that helps,
SchaOn