Cleaning Cable Housing?
Sad to say, not worth the effort!

However, if you are a bulk user of cable outer then you can invest in a big reel of the stuff (obviously genuine Shimano) and some Shimano cable cutters (TL-CT-10).

Broken link: http://www.madison.co.uk/productinfo.aspx?catref=6Y1+9801

Possible replacements


https://www.google.com/search?q=Shimano+cable+cutters
http://www.parktool.com/product/professional-cable-and-housing-cutter-cn-10
https://www.google.com/search?q=shimano+outer+gear+cable


However, order by Madison part code from your LBS and get the brake cable outers whilst you are at it.

The inners are easy to clean up, the outer liner erodes over time and no amount of blowing soapy water through shifts the detritus.

That part is the 'XTR' version, there is also a cheaper one that should work fine.


These are good, just so long as you don't cut mudguard stays with them: