PB Blaster is awesome stuff. Soak it with PB. Put the hub back together and screw the QR end on so that the end of the QR axle almost pokes through. Now hit it with a hammer. If that does not work it might be time for a new hub or a new wheel. If the QR is seized in the front hub, how is the rest of the bike? Check the bottom bracket, rear hub bearings, the rear freehub is probably trashed, head set bearings, pull the seat post and grease it, have the suspension fork overhauled. Bikes and water don't mix. I have been seeing a lot of bikes in the shop this year with issues because of the wet spring we had. One customer was riding to DC and the C&O path was flooded by 1-2 feet of water. He did 130 miles of riding in water that day. Needless to say his bike was trashed. There was water everywhere, it even contaminated the oil in his Fox fork and filled his damper full of muck. Another customer was riding with some buddies and came across a swollen creek crossing. They decided to swim across with their bikes. The customer came in with a $3500 bike that he bought a few months ago with almost every bearing locked up. We had to rebuild everything.