AlumKlean

AlumKlean is made to clean stock, painted aluminum, AlumKlean removes black streaks and stains consistent with a naturally occurring process called "aluminum oxidation" or "tiger striping". AlumKlean does not clean and brighten bare aluminum (we are currently formulating a new product to clean "bare" aluminum so please check back if that is what you were looking for). Aluminum, why doesn't it clean the way every other surface does? Why can't you get it clean? What are the black stripes, black streaks or black stains? And why can't you clean them off? We were painting our house a couple years ago, the gutters had black streaks on them, I later found out they refer to those streaks on gutters as "tiger striping" anyhow I got some soap and water and tried to clean the gutters, nothing happened so I broke out the pressure washer and started out with 1,000 PSI and again nothing happened so I turned it all the way up to 4,000 PSI and nothing happened, it was still as dirty as the minute I b