We've had a large number of grey streaks, mainly on the side skirts of our motorhome. Over the years I've tried all sorts of well known motorhome cleaner products that are designed to clean these sorts of stains. None have worked. I've ebbed resorted to TCut, which hasn't worked either.I saw this product on Facebook and thought I'd give it a try, not expecting anything special.It's Amazing. It took all the surface grime of with a gentle rub but left some of the heavier stains. I did then applied some directly to a microfibre cloth and rubbed it onto the major stains and what a result. It did take a bit of muscle effort but all the stains have gone. I sprayed done on the front grill, which had done algae build up and before I got to rinse the spray off, I could see the algae lifting and running off. Using the Spot Wax Finisher afterwards really brought the paintwork up. I am so pleased that I found this spray. I don't often leave reviews but do so when a product exceeds my expectations.