So bumping this thread, and apologize for hijacking but my searches for 303 protectant brought me here.  
I'm focusing more on the matte sheen and its use for interior dashboard cleaning/protectant.  Needless to say, I'm obsessed with keeping every speck of dust off my dash.  But to no avail, after I thought I had all the dust cleared off, I see a piece here and there.  
Has anyone used the 303 Interior protectant?  How does it do keeping the dash clean and dust-free?  More importantly, does it leave ANY shine at all?  I like the factory flat/matte sheen and I don't want that changed.
I've done everything, using a lint brush before I get in, using MF towels at stop lights, the dust just never stops.