I presume when you say "looks like little worms" you aren't referring to actual holes in the aluminum skin, but rather the frosty looking appearance of clearcoat degradation, or oxidation of the skin.
It sounds like the clearcoat is all but gone.....Ours is that way...balding on top, and thin around the edges. Crap!!! Sounds like my hairline.
You can live with, call the hairclub for Airstreams, or remove it. A 1970 27' Overlander would look mighty fine all polished up and shining.
If you can post some photos it would help.
Best of luck and welcime to the group.
"You wouldn't worry so much about what others think of you if you realized how seldom they do."