Hi Harvey, What I use to free rusted parts are: AERO KROIL Kano Laboratories 1000 S. Thompson Lane Nashville, TN 37211 This is only available through mail order; I've never seen it in stores. The other is: CRC 5-56 CRC Chemicals USA Warminster, PA 18974 The CRC products are available at automobile parts and supply stores: also you will find it in Welding Supply shops. Both products have done good jobs for me, and I don;t prefer one over the other. Usually it's a case of which spray can is within reach? Garage or downstairs in my shop. After you have soaked them for a few days, try warming the studs with a small propane torch. Heat does a good job of breaking down rust. Just be careful that you do it outside,; and have a fire extinguisher handy if things start burning (the oil in the solvents). Another old trick is to take a larger size pin punch and about a 2 lb hand sledge hammer. Put the pin punch on a corner of the hex of the wheel nut, then try hitting it with the 2 lb sledge. Short sharp blows will (hopefully) loosen the nut. What you are trying to do is position the punch so that you apply tangential force to the nut (trying to rotate the nut). The combination of soaking in a rust solvent; applying heat to the stud; and applying force with the hammer should do the trick.......... Next time put some water pump grease on the stud threads before you put the trailer in water! Good luck Connie