Black streaks on aluminum siding

[gingerK]

What can I use to get the black streaks off the aluminum TC siding? The black streak cleaner doesn't do anything. Any suggestions would be appreciated, thanks.

[jfkmk]

I use Simple Green on my aluminum sided tt. And it works great. Much better than the black streak remover I had previously bought.

[copeland343]

Bio-Kleen

[justaboutretire]

On my old trailer I used Bon ami cleanser with a damp sponge. Worked pretty well.

[jimh406]

People use polish on boats. I don't know what people use on TCs.