Dissolve central gear screw

Hello, since I have to change the left drive shaft with my Audi 80 2.0E with ABK engine (with ABS). I tried to solve the central screw between the 4 other wheel screws as first, after which I sprayed something with rust solver and WD40 before. Then I tried first with the ratchet, then with a long torque wrench, then with a handshake wrench and finally with an air pressure impact wrench tried to get the thing up. But no success. If someone had a good advice for me like I could still try it? Wouldn’t be spraying with WD40 for two more days now, and then if the car was not moved (because of the heat) try again to release… with friendly greetings