PP Help in LR or PS CS4

This is the actual raw jpeg
http://i42.tinypic.com​/sv2ero.jpg

The floor and the background were both white. I kept a transparent plastic sheet on the floor so as not to mess it with the cake. Now I want to get rid of the lines and make the background/floor look white (milky white). The raw file can be downloaded from here http://www.megaupload.​com/?d=3G4YHBX0

I want someone to teach me how to clean this pic and make it look good. Take out the lines, make the background and floor white (like there were) and make the cake stand out. I would really appreciate it.

Thank you.

It would take some significant clone and stamp plus healing brushes, and adding extra blur effect. Hopefully some expects can chime in with easier steps.

I'm no expert, but I would start with the quick select tool and see when you can do to select the cake and candy in the background and then inverse so that any cloning will only affect the floor and not the cake. Then you might try to find a picture or take a picture of the floor and move the cake onto that picture all via CS4.