There's a few ways to mask the sickness that are easy but it's cheating, so I won't reveal them here.. things like burning the sickness out with hydroflouric acid, coating it with olive oil, mineral oil, even nail polish.. just keeping them filled with water and corked ..
I have used a grinder with cloth buffing wheel to clean areas on the outside of a sick bottles. You need to apply a cutting or polishing compound. Works best on cylindrical bottles. If you get the glass to hot it will crack.