Help! Wheel change S60 – Clamp rear wheels

Hello together, I wanted to mount the winter bikes on my S60 today, at the front it worked without any problems but the rear wheels sit bomb-proof, wheel bolts are off, no problem, but the wheel itself does not give in a millimeter, has already sprayed rust solvers in, but so far no effect, on both rear wheels. Is there perhaps a trick 17? Cann’t it be that it only hangs on the rear wheels??? Many thanks and greetings, thunderbolt