Upload & Sell: On
As Beauchamp says, you shouldn't really have a problem with gentle cleaning.
If you bought it new, it is under warranty, and of course Canon will clean for you. Just box up and ship to a Canon repair center with a copy of your invoice.
Otherwise, the focus is okay, not out of adjustment (front or back-focus?). You should fully check it out so any other issues can be addressed a the same time.