Canon W7250 - Manual (Page 112)

Maintenance
14
6-14
3
Fold a sheet of plain paper (a) 2 or 3 times, then insert it from the
back of the printer below the lower surface of the paper restraint (b),
then use the paper to clean.
Be sure to clean the entire surface of the paper restraint.
4
Plug the power cord into the power source.
a b