If you have spilled grease on a hardwood floor you know how difficult it can be to get it all up the first time. All you have to do is rub the area with an ice cube, making all the grease hard, and then you can scrape it up with a spoon or scraper easily.
You can get the grease out of the cracks by using a towel placed over the flooring and using an iron over the towel. As the warmth melts the grease it will be absorbed into your towel.