I am a janitor at a local business downtown that has several large business type desks. The wood is a light yellow/blonde & it is shiny. Except there are smudges & fingerprints that absolutely will not come off. I have used lemon pledge, vinegar, alcohol, car wax, car buffers, over the counter products to no avail. The smudges & fingerprints remain. What to do? It is so frustrating! Sally