Question about outside sticks and rocks

[Vengeance]

What is the best way to make sure that sticks taken from the outside are free of insects? I know you can either bake them or soak them in bleach and water, but what is the most effective way?

How much of a water to bleach ratio fo you need?

If bakeing wouldn't the sticks catch on fire? If not what tempature does the oven have to be at in order to make sure tha all the insects are killed?

Should I take off all the bark first or is leving the bark on ok?

Thanks.