An image forming apparatus comprising: an image forming section to form a
toner image based on print data; a transfer section to transfer the toner
image onto a transfer sheet; a fixing section to fix the toner image
transferred onto the transfer sheet; a cleaning section for cleaning at
least one of the image forming section, the transfer section and the
fixing section; and a control section to determine an existence area of a
real image in a print image based on the print data, to determine a size
of the transfer sheet, onto which the print image is printed and to
control the cleaning device based on determinations of the image
determination section and the transfer sheet size determination section.