A tornador is mainly an interior detailing tool that is supposedly safe to use on all interior panels including gauges, radios, vents, controls, etc. It spins out high pressure mist and cleans the area I guess. I'm not sure if there is any agitation done by the tool or if it simply cleans by pressure. I steam cleaner is probably a more useful tool to have, IMO. A foam gun is just a hose extension that makes soap suds up before washing, two completely different products.