Tricky frame cleaning.

[Tranquility Base]

I'm about to strip down my Kileauea so I can put some Frame Saver in it. Problem is the seat stay bridge is full of crud inside (there's a 5mm hole in it for mudguard or some such fitment).
Has anyone got a good method of getting into tricky areas to clean?

 

[orange71]

pipe cleaner? or one of those brushes on wire that you can bend into shapes to get round corners?

 

[scant]

airline. or nick some of those compressed air keyboard cleaners from work

 

[Tranquility Base]

Thanks
I'll get poking and blowing right away.