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Burns
Burns on hardwood floors can be common, especially in the kitchen area. The severity of the burn defines how to fix it. Surface burns can usually be buffed out but deeper burns need to be cut out.
Water Stains and Damage
Most hardwood floors will get some type of water stain at some point. Typically water stains can be sanded out without having to remove the floor. Water damage from a flood can cause the floor to warp and rot. In this case the floor needs to be removed and replaced with a new one.
Scratches
Scratches are common to hardwood floors and are easily buffed out and resealed. However, large scratches or gouges are more severe. Wood putty and a hand sander will fix the gouge in many cases. If the gouge is large and has affected multiple boards, then they may need to be replaced.
Stains
Most hardwood floors are sealed well enough that anything that spills onto them will not leave its mark. But sometimes stains appear on your hardwood floor if not cleaned up immediately. Stains can be fixed by just buffing them out and then reapplying the finish.
Acidic Damage or Basic Damage
Acid damage is more common then you think on your hardwood floors. If any type of ammonia gets spilled, it will immediately begin to eat away at the finish. Citrus juices, bleac, and fingernail polish remover are also hard on the finish of your floors so they need to be wiped up immediately. Spilled milk will spoil and will also eat away at your finish if not cleaned up right away.
* Information above was gathered from www.ehow.com written by a eHow contributing writter.