I have a squeaky seat on my bike. The squeaking appears to originate from a type of mechanical twisting/bending motion, it is not due to springs or fabric in the seat. I tried to spray some WD40 on the underside of the seat, but that didn't help at all.

I realize this is a hard question to answer, but is there some advice that can typically be given in the case of a squeaky seat?

What should I lubricate with? WD40? Oil? Grease? How should I lubricate? Do I need to remove the seat and disassemble it, or can I just spray directly onto it like I previously attempted?

In general, what is likely to work in a case such as this one?