Sheldon Brown! PB Blaster!! More importantly....SLOW DOWN!!! WD-40 is not a penatrating fluid!!!! That said as I have asked less than captivating questions.....
My experience. Take out bottom bracket so you can spray PB Blaster down (the bike's up) seat tube. Do this every day or 12 hours while it is in some sort of holder upside down. Let it work for a week if you must...or longer. Penatrating fluid will get there eventually. One more tip I was taught. The fluid gets into the "seam" a bit faster with little tapping every time you walk by. Suggest tapping on the seat post up while the frame is upside down. Vibration helps it work in. You are not trying to force movement, just VIBRATE. Read, hit it gently! And yes, you may tap and spray PB for a week+ but it will work free. Done this on old (1914) engines left outside as well as bottom brackets of nice old bikes that shops toss in the trash.
Good luck...and yes, use the search even more liberally than PB Blaster
