In the process of restoring my car I pulled off the washer fluid bottle, clutch reservoir and brake reservoir and soaked them in a container full of bleach for about a week. This is something I've done a few times before with yellowed automotive plastics and it usually works really well. I once soaked a old Triumph washer bottle for 5 months and it came out looking like new. Well for some reason I have a problem this time. I peeked in after a week and the clutch and brake reservoir were lightly covered with a white film that was really on there, wouldn't scrub off short of steel wool. Then I figured maybe I'd try putting them in a vinegar bath to see if that might eat it off, but after 4 days it doesn't seem to be making a difference. Can any of you chemically inclined members lend some advice?
