Everybody knows WD-40 is the go-to product for silencing squeaks, displacing moisture, preventing rust, and loosening stuck parts. You probably have a can sitting in your garage right now. It has a ton of uses, but it's no panacea. In fact, there are a some jobs that the lube will absolutely ruin.

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1. Lube a shovel. Spray WD-40 on a shovel, spading fork, hoe or garden trowel. The soil slides right off—especially helpful when digging in clay.

2. Clean tile. The spray removes spilled mascara, nail polish, paint and scuff marks from tile floors, and also help you wipe away grime from the grout lines. Clean up with soapy water.



4. Unstick gum. A squirt makes it easier to pull gum out of carpet and even hair. It's better than cutting out the gum and leaving patchy carpet or a bad haircut.

7. Erase crayon. When crayon ends up on toys, flooring, furniture, painted walls, wallpaper, windows, doors, and television screens. Spray on WD-40 and wipe it off.

9. Get rid of rust. Spray and rub away rust from circular saw and hacksaw blades. It can also clean blades of tar and other gunk.

1. Door hinges. Sure, WD-40 will stop the squeaking, but it also attracts dust and dirt. Over time, you'll end up with ugly black streaks on your hinges.

2. Bike chains. WD-40 can cause dirt and dust to stick to a chain. Use bike-specific lubricants, which typically contain Teflon.

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4. Locks. The spray can prematurely wear down the internal mechanisms, especially in the pin tumbler locks, in door locks and padlocks. Go for graphite powder.

5. iPods and iPads. WD-40 won't repair the Home button on these devices. In fact, the spray can cause the plastic to break down on the cover, and if some gets inside the electronics, it can damage plastic parts inside.

Images courtesy Flickr users rvettese, Martin Labar, and M Rey Alonso, used under Creative Commons license.

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