Help! How to deal white spots on oak furniture

I don’t know what pre-treatment you are talking about, but wood will fade in sunlight, whether polished, varnished, waxed or untreated. You probably need to get a furniture restorer to deal with it but do move it out of the sunlight!

I've had this problem with several light oak table tops. I used a Guardsman Ring and Mark Remover cloth which solved the problem. It took perseverance with rubbing for the marks to go. The cloth left a slight shine on the wood, but it was a definite improvement. The instructions say it's not suitable for unsealed and oil-finished woods.
I once tried rubbing mayonnaise on a white spot and that worked too. I must have found that tip on Google. It's probably best to experiment on a small area first!

If it's white spots from liquid spills mayonnaise will probably get it out - just rub a bit of mayo in, cover and leave for a few hours and rub off. The oil in the mayo displaces the water. I did this on an old cupboard and it worked. But it depends on what the white rings are.

fine wire wool, methylated spirit and rubbing along the grain, this will remove the surface coating. Lightly sand again along the grain to remove any surface debris. Wipe with a damp cloth. Then coat very finely via several coats of a good coloured danish oil in the appropriate colour, lighter is better to start with. Rub down in between each coat. You can finish/topcoat with briwax. Each coat needs to be thoroughly dry and applied very sparingly and wiped with a lint free cloth

Use a brazil or walnut kernal. Just rub gently and the mark will go. I used a brazil nut to get rid of a water stain on my teak coffee table.

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I've also used the walnut method with good results, but it must be a fresh walnut - not one of those dried up things we get for cooking. I think its the oil that does the job.

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I’ve reported this, as the link is to an American company’s products.