I bet that stuff would be good for gunked up chains and sap stained bars. The caustic cleaners work are very effective compared to simple green etc. Literally dissolves gum and does the hard work itself and you rinse it off. The caustic spray I used to get from Solo was incredible, a quick spray and rinse on a sap filthy chain would turn it into a shiny gleaming chain that with rivets as smooth as new. But care needs to be taken, eye protection, lots of holding your breath and plenty of water to neutralise it when done.