Choose your cleaning product
We can divide oven cleaners into two categories: natural and synthetic.

  The general consensus is that synthetic cleaners are more effective at cleaning but are more toxic if they leave residue.

  While this may be a rule of thumb, it's certainly not a panacea.

Alternatively, some product purists go a step further and use the following:

Eucalyptus Oil
White Vinegar or Apple Cider Vinegar
sodium bicarbonate
 
While these are great at killing bacteria, they don't actually contain surfactants, so it can be difficult to actually remove and remove food stuck to the oven.
We can divide oven cleaners into two categories: natural and synthetic.

 The general consensus is that synthetic cleaners are more effective at