Baking soda is a really natural way to clean things - just mix it with a bit of water to make a natural alternative to jif or other abrasive cleaners. And lemon or white vinegar are good for smelly areas like kitchen bench or chopping blocks.
That cleaning program they have on Wednesday's on Channel 1 use all natural ingredients...you should watch it to get some tips
Stay away from the oven cleaner - thats the most toxic and corrosive of all the cleaners. I always get DH to do the oven now hehe!!