desperate for an idea on natural oven cleaners

I'm in great need of ideas for all natural oven cleaners. Lemon juice? Vinegar?

Bicarbonate of soda is good if i remember correctly hun? Will try and have a look in my household cleaning book if i can find it? Xx

http://www.channel4.com/4homes/cleaning/how-to-...08-10-02_p_1.html