Has anyone used this on the heat tubes on the intakes?

I saw this and thought it might work for cleaning out the heat tubes under
the intake manifolds.
Snake Bit........flexible drill bit
http://www.califautotech.com/
Not sure if they are flexible enough to turn the corners without drilling
through the tubes.

I usually use an old clutch cable and a lot of time to rod out the carbon
through both sides. TG I don't have to do it to too many Beetles anymore,
but regrettably I don't see a lot of them anymore. :-(
--
later,
(One out of many daves)