Restoring a 1988 Supra Targa 5 speed with my son. Has not run for 18 years. Beautiful car, terrific big straight 6. Two cylinders have condensation-caused rust spots on the cylinder walls. They must have been the unlucky ones with open valves. At the rings, there is also a slight line of rust. I would like to remove the rust best I can, then we will hone the cylinder walls with a ball hone and re-ring this low mile engine. If I don't remove the rust first, I don't think the ball hone I bought will work like the traditional actual hone stones, which would knock down a high spot better. The ball hone is more "flexy" and I'd be afraid it would not place higher pressure on a high spot, thus leaving possible remains of a high spot. I've got a piece of right diameter PVC I was going to gently work these problem areas with before honing, using some mild abrasive. However I got to wondering if Naval Jelly would dissolve it and physically remove the substance that is mildly proud on the cylinder walls (the rust). Anyone have experience - does it truly chemically dissolve the red rust deposits and based on your experience with it, would this be a good move? It will be a bare block, so no pistons and I can easily clean any residue. Thanks in advance.