It is probably moisture in the finish. Quite common and easy to repair. I use the cloths then clean up the oil and adjust the sheen using lacquer.

"Polish" means different things in different locales. Want to elaborate what you mean by it?

Here is a link that might be useful: Removing water rings

Thank you. I am just not sure what the finish is on the cabinet. If I could have your email address, I could send a photo of it or is there a way to add a photo here?

Open a web-hosting account such as Photobucket, upload photos and link.
Before

Thanks Bobsmyuncle. That mark on the photo is minor compaired with the marks on my cabinet.

I haven't uploaded photos to Photobucket before but I will try.
Thank you.

This bad?
Before

After