You will be surprised to learn that some of the very aggressive inorganic chemicals, like Sulphuric acid, Myriadic acid (aka. Hydrochloric acid), Nitric acid, Phosphoric acid, Ammonia, Sulphur, … are in fact being used as fertilizers. (!) So i could buy a gallon of 40% Sulphuric acid at customhydronutriens.com for a bit less than $30…And where does one buy sulphuric acid from?
To make it clear: I will not spray sulphuric acid into my duck-house! I just wrote this as an exaggeration to picture how thorough that duck house cleanup will be! - I will use the pressure washer for the floor-boards and may even use some bleach though.

I have made personal experiences with all »classic« acids and there was a time when i was only wearing »designer-« jeans and shirts…
