I ran out of the AlumaBright I was using to clean parts and the local store only had a product they just started carrying. Lume Bright. Before using a new product like that, I test it out on a non-important piece. I used it on one section of the broken knuckle and was amazed. No removing dirt or grease first. Just sprayed it on and agitated with a small chip brush (soft bristle). See for yourself.