Just found this:
http://www.audi-sport.net/vb/a3-s3-sport...boost.html
Says to use a wire wheel on the housing, but doesn't mention the sealing surfaces? Don't really wanna bugger it up. I heard it is just to stop exhaust gases going to the compressor side but still? Edit: On the thread another person has mentioned dropping both housings in cleaner and leaving to soak. But what kind of cleaner? Caustic Soda? White Spirit? Coca-Cola? That seems like the safest option rather than scrubbing it with a metal brush
http://www.audi-sport.net/vb/a3-s3-sport...boost.html
Says to use a wire wheel on the housing, but doesn't mention the sealing surfaces? Don't really wanna bugger it up. I heard it is just to stop exhaust gases going to the compressor side but still? Edit: On the thread another person has mentioned dropping both housings in cleaner and leaving to soak. But what kind of cleaner? Caustic Soda? White Spirit? Coca-Cola? That seems like the safest option rather than scrubbing it with a metal brush