When Amber mentioned using a steam cleaner to get rid of stubborn shower mold, I had one of those slap-your-head-and-say-Duh! moments. For no chemical cleaning, you can't get any better than steam cleaning. High temperature water vapor (up to 240°F) kills pretty much everything, and is particularly effective at getting rid of mold, removing wallpaper, and buffing ceramic tiles to a shine.
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1 Haan HS-20 Personal Handheld Steamer ($51.45): The 212 degrees Fahrenheit that shoots out from this steam cleaner kills germs with no need for "a floor polisher, glass sparkler, oven cleaner, mold buster, tile blaster, or protective rubber gloves." The unit works with regular tap water, heats up in less than 3 minutes, and will provide up to 15 minutes of continuous steam on a full 6-3/4-ounce tank of water.
2 Wagner 905 On-Demand Power Steamer and Cleaner ($85.83): The 905 includes a wallpaper steam plate (for easily removing wallpaper without any chemicals), a floor cleaner attachment, window/tile squeegee, two extension tubes, and jet nozzle. This model consistently gets good reviews on both Amazon and eBay, and it's reported to be especially effective at removing mold from bathroom grout.
3 McCulloch MC-1275 Heavy-Duty Steam Cleaner ($94.95): great reviews on Amazon, this small, heavy duty handheld steamer has 1500 watts of steaming power, a 50-ounce water-tank capacity, a steam-control switch (a nice feature that some of the other steamers don't have), and a storage compartment for 10 included accessories.
4 Eureka 313A Enviro Hard-Surface Floor Steamer ($65.58): solid reviews across the board for this floor steamer dsigned for use on wood, granite, laminate, marble, and other hard, sealed surfaces.
5 SteamFast SF-275 SteamMax Steam Cleaner ($95.54): Made by the same company as the McCulloch cleaner (you can see the resemblance).