Don't bother trying to clean up your old bolt, just buy a new one!
It will look better and save you time messing around, when you could be doing something more worthwhile, like browsing the Product Gallery for your model!
You can see other items that you need to order but may have overlooked!
Some other bolts that relate to these models:
The more comprehensive your order, the better value for you in reduced shipping costs, when divided over the number and value of your order. Please make sure the parts you order are compatible with your model.