I do have an air compressor with a blow tip, maybe that could work. I also have some cylindrical wire brushes I got specifically for cleaning out parts of the bike like this. The only concern I have is getting them stuck inside the tube, as they're short and need a socket extender to get deep inside the seat tube. What kind of cleaner do you use,
@Drosentreter? I've heard of POR15 from the VW guys, but I don't have any on hand. I might see about getting POR15, but do I need the full kit, or can I get away with just a small can of POR15 paint? I do have some sprayable rust inhibitor I haven't used yet. Would that work? I'm trying to save as much money as I can right now, and if I can avoid spending any, that'd be even