They need to be cut off first. For relaxation and agitation, the WD 40, perhaps an even better MD40, could help, but it's time to let it go. Sometimes to loosen rust, soaking in kerosene or diesel for a long time will help. You could also use a transformer for cutting and try it by electrolysis. In any case, it will take some work and it will take a while for it to cut off properly. Then dry and preserve. The WD 40 will be good and functional. Of course, another oil can also be used. But never kitchen.