I have never heard of this. Is it possible the power steering line rusted and it just squirting fluid up the shaft from a pinhole in the line. With the fluid spaying on the shaft sending it into the cab.
Clutch and brake fluid can leak in if they those seals are really warn. Rare though.
Welp I totally read that wrong I guess, For some reason Passenger compartment ment passenger side in my brain. I guess ignore my post cause im confused on how fluid could get to the drivers steering column from turning the wheel. There isnt any fluid lines there.