Photo Editing - Change Product Background To White

There are 650 product images in grey backgrounds. The products need to be displayed by themselves on a white background.

Some of the images are a little tricky, please only apply if you have the required skills. (Future work is also possible)

As i run the firm myself and short for time i am looking for someone to complete this in a very short space of time.

I need a turnaround with 2 to 3 days max.

I will provide all images.