Challenger Floor Cleaner, 5 L, Mild, Biodegradable cleans walls, floors, doors, windows, concrete, tile, grout, siding, outdoor furniture, grills, engines, heavy equipment, auto, waste containers, and more! Challenger is a biodegradable alternative to hazardous solvent-based cleaners that can stand up to any residential or commercial cleaning task. Challenger is available in convenient spray bottles, as well as cost-effective concentrated containers that can be diluted to the appropriate strength. It is water-based, yet more effective than many solvent-based cleaners, Challenger will not harm plants or foliage. Challenger can help you tackle most cleaning applications.