Clean Up Icons and Add to Transparent Background

I have 8 icons that are currently on a white/gray background. I would like the images cleaned up (all white removed - ESPECIALLY around the icons). The icons should be put on a transparent background (so that they can be added to any color) It is EXTREMELY important that the images be VERY clean and have no white or gray. Once you are completed I will inspect the images BEFORE payment is released (you must send images before payment - so this can be checked. I'm sorry to have to do that - but, I have been burned by too many providers before.) Should be a simple and quick job for someone with experience.