Although Guild takes pride in its nitro finish, I think it's more a liability than an asset. There are modern finishes that go on thin, look great, and wear like iron.
People's body chemistry can react with finishes. I've noticed guitars in shops that had unbelievably sticky necks that no amount of wiping down could help, yet have played identical guitars that haven't been handled by a zillion people that never developed that stickiness -- presumably because no one with reactive body chemistry had played them. Some of the unsticky guitars saw a lot more daily playing over a longer time than the ones in the stores, yet never became sticky. I can't state this as a fact but I strongly suspect that body chemistry may initiate changes in the surface that makes it sticky.
I'd recommend keeping wax off of guitars if you're having problems with a cloudy haze developing. You know those white rings you get on your coffee table when you set a glass with ice in it on the table and it sweats? That's wax reacting with water. This isn't the only process that can cause clouding, but it's one of them.
A good cleaning with naphtha should strip off wax, which may help. Really, just a wipe-down with a dry cloth should keep a guitar clean. Next step up is a wipe-down with a barely damp cloth, which will remove any water-soluble grunge. Next is a wipe-down with a naphtha-dampened cloth will remove more stubborn grunge. Lastly, something like swirl remover is about the most aggressive cleaning I'd give a guitar. It will remove stuff that's embedded in the surface and will also remove small scratches and restore luster. I use the Meguiar's auto products that are sold for cleaning convertible top plastic windows. It comes in two stages, one a cleaner and one a polish. I've used it on everything from century-old-plus vintage instruments to much newer stuff than needed a thorough cleaning. It works great, but is rarely needed.
