The day before you want to make the waffles, take your sourdough starter out of the refrigerator and place on the counter.
In the evening pour the starter into a large bowl and add the lukewarm water and flour. Mix until combined, don't worry about lumps. Cover and place in a warm area overnight.
In the morning, remove 1 1/2 cups of sourdough (your starter) and put it back in your starter container and place back in the refrigerator.
Add the sugar, eggs and melted butter and canola oil into the sourdough batter and stir well until combined.
Add the baking soda and salt and whip until combined.
Heat waffle iron to hot. Spray the iron with cooking spray. Using a 1/3 measuring cup pour batter over the waffle iron and cook for about 4 minutes (every waffle iron is different) or until the waffles are golden brown.
Remove the waffles and place on a wire rack. Do not stack the waffles on top of each other or they will become soggy.