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@OldSkoolRacer
I recently used the "caustic soda method" on a pair of stuck Miche (alu) BB cups. Think i had the solution a bit too weak as it took a full week for them to dissolve. Works very well though as it doesn't harm the steel or (apparently) the paint. My paint on the other hand has white stain marks around where the water line was (seat stays, downtube, seattube) but i'm not sure if this is due to the frame being in water for 7days constantly or due to the caustic soda?
Shoudda made some HTFU strength caustic mix in retrospect as Armourtex is now very tempting...