Lingering Oily Residue and Odor from My Philips Airfryer

I bought a Philip Airfryer about six to seven months ago in hopes of making cooking healthier. But now it's a nightmare to clean. Even if you use it carefully, the leftovers from cooked food stick to it and make it smell bad and even smoke. The smell fills my house, which makes using the Airfryer unpleasant. I never thought that an appliance that was supposed to make cooking easier would give me so much trouble. I really hope that this problem can be fixed so I can use my Airfryer again.