Scanning document Hello, I've purchase the Fujitsu fi-5120 scanner and I like it alot but, when I scan a document and save it as a .pdf file, I open the document and it shows a pink markings on it, its not a clean document. I cleaned the glass with a special cloth, but it shows marks on my document. Do you know why this is happening, do I need to adjust something.........ummm clueless here.