A few years ago there was a show on HGTV / DIY network / ? called Holmes on Holmes.
He and his team rehabbed a rental house used as a marijuana grow house. Serious mold in attic. Dry ice blasting got rid of the mold. (Was on inside of roof sheathing.) Only time I've seen it used.
Not sure on aluminum. What are you trying to do? Maybe soda blast - walnut shells - ? I would think aluminum would get galled up by dry ice blasting.
Years ago we tried it for cleaning plates instead of water blasting. It is neat to watch since the ice just evaporates. For us it was to slow. The person loading the hopper also needs to be careful so they don't get burned.
We used to have dry ice blasters at where I used to work. They used them for cleaning resin off of the anodized aluminum molds used for carbon fiber. These machines were awesome. They left the molds looking brand new.
My wife's Mercedes had the clear coat peeling off really bad. I took the clear off without damaging the paint underneath.
There is a local shop that does cleaning of car parts and cars. I had the underneath of my car done to remove grease and dirt from a few areas. I think it was $80/hr. Most of the people around here only do industrial field work on plant equipment. He has a special cabinet if you want a fancy finish on aluminum. Its some sort of glass bead slurry called Vapour Honing. Parts look really good after getting done. Not DIY due to equipment cost. Dry Ice blasting isn't DIY either as you need a very big compressor and a very expensive dry ice machine. At home I just do soda blasting out in the open.