I ran across this bit of information from http://www.SilcoTek.com.They have a product called SilcoKlean®1000.While not available yet you never know what other services company's in the business may offer in the future.A suppressor coated with this would be easy to clean.

http://www.azom.com/article.aspx?ArticleID=12589#4

http://www.rrdvegas.com/silencer-cleaning.html

a number of different silicone fluids, 350 cst pure Silicone Oil ( $18.00 on Amazon) is the way to go according to the testing in this article.

The DOT 5 brake fluid / silicone oil looks like it does have a positive impact on ease of cleaning and I plan on giving it a try.