Cleaning a lifetime shed is actually simpler than you might think. Because there is such little maintenance a garden hose with high pressure spray nossle usually can do the trick. However, if you have a spot that has unusual exposure to dirt and mud a large sponge and soft scrub brand cleaner or another gentle cleaner will work perfectly. No need to use abrasive brissle pads or other hard textured cleaning products. It can scratch the shed. The shed, however, is the same color throughout the plastic so even if it happened to be scratched it doesn't lose it's color like wooden or some steel sheds. The best way to keep the shed clean is to prevent it from getting unecessarily dirty by allowing piles of compost, leaves, and other problematic items to lean against it.