Well you can use a file if you know how not to get the debrie in there or know how to get it out, since the pipe is open at both ends a quick burst of any gass of your choice will clean it nicely. Secondly yes there are two diferant types and you definatly want to make shure you have the correct one for the material you'll be working with.

As they say, you get what you pay for, Never buy cheap tools, it is never worth what litle you'll save!