To pick up on Fred's excellent advice....
The problem with photographing a highly reflective object is two-fold.
First, what is primarily seen is the objects that are beyond the blade at the reverse angle that the camera is. Think of it as a ricochet of light. What is in the reflection is what you photograph. The more light, the worse it is. A dark or even tone background is the way to go. Use a large piece of gray, medium blue, or black cloth. It should be in the reflected view.
Second, there are two things you can focus on. One is the blade surface, the second is the reflection. Make sure the blade is what you are focusing on. Manual focus may be preferred. Along with that, any object on the blade surface will stand out from the reflection, because it is in focus and the reflection isn't. The smallest pieces of dust or finger spot will show up likehandfulull of gravel and tire skid marks when the photo is cropped. Clean the blade well and blow off with a can of air just before shooting the photo.