by the look of that printer the fuser is located at the top. It will be the part that gets very hot. There are 2 rollers in a fuser, a hot roller, and a pressure roller. The hot roller touches the front/printed side of the page, the pressure roller touches the back side of the page. Cleaning it probably wont fix it permanently. The type of paper you use can also affect how toner fuses to the page. make sure you have the correct paper setting in the print driver for the type of paper being used.
How do I clean it?
Have had the printer about 2 years, fusers should last longer than that shouldn't they?