Here are a few things I found just digging around search engine. Hope this helps.
http://www.ehow.com/how_4488340_cle ... medium=ssp&utm_campaign=yssp_art
I've had my magnalite pots 14 years now and they still look brand new. I use Cameo Stainless steel cleaner. It's about 97 cents at Walmart. It makes your sink shine awesome too.
Shirley golden7673 AT yahoo.com
I use to have magnalite pots & pans. They are hard, anodized aluminum.If you cook something with tomato stuff in it, (acidic), it should change the pan back to normal. You could also try scrubbing with some vinegar & see what it does, or try soaking with some vinegar & water. I'd keep checking to see how it was going. When ever aluminum gets dark spots, is usually from alkaline stuff coming in contact with the metal. Drano & the like is very alkaline. If it's strong enough & left long enough, it could damage the surface, but I'd try the acidic stuff for a bit. They are nice pans. Now with stainless, acidic stuff makes the surface darken.
I wash my Magnalite cookware in the dishwasher, using dishwasher powder. This leaves some sort of residue on my pots. When I dry them (I never use the heat dry cycle), the residue leaves a black-silverish stain on the dish towel and you can almost feel the residue when you rub your hand on the outside of the pot. I have to scrub them with Chore Boy after taking them from the dishwasher to get the residue off. The water from the washing is dark silver or black. Am I not supposed to wash my Magnalite in the dishwasher?
Carolyn from Shreveport, LA
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