Cleaning out Seat tube

[Knoxxy]

I'm building a Redline cruiser & went to put seat post in.
It sounds horrible & the post is super tight, and scratched when removed.
Sounds like the tube is full of rust.

Any tips for cleaning out the tube before fitting?
Thanks.
Knoxxy.

[Dannywhac]

I use a bottle brush you can get in homebrew shops + a squirt of WD-40 to give em a good blast out

Also check for weld spatter on the inside of the tube where the seat stays meet the seattube - if there is some get a metal file and give it a going over.

[Knoxxy]

Great tips.
Thank you!

[sawzall]

i use a flexi drive on a drill with a flap wheel

[Gary72]

Also check the slit/hole at the top.

[oldschoolib]

sawzall x2

[skyway67]

hi had the same trouble so i honed it out at work
 

[animal]

If its just rust will the seatpost tube with vinegar. This will clean all the rust off in a couple of hours