After checking in my reference books, I went to the Hysol website and read what they had posted for their surface preparation prior to bonding.  For our thermoset composites, they said basically the same thing as the ASM book did, i.e.

 

1.    Degrease before sanding using either MEK or acetone

 

2.    Mechanically abrade the surfaces to be bonded

 

3.    Repeat degreasing with acetone or MEK

 

As I said before, the means of contaminate removal isn't all that important, only that it must be clean.  A freshly abraded surface is great to bond to but suffers from dust in the bondline and that is the sole purpose of solvent wiping.  A 100% pure solvent evaporates leaving behind no contaminates, hence my concern about hardware store acetone.  Just use it for cleaning brushes and tools and you're fine but it's better not to use it for cleaning prior to bonding. Technical grade acetone is a fairly pure acetone and easily available from chemical supply houses.  Analytical grade is better but somewhere around $150/gallon as I remember and the results doubtful as to how superior over technical grade.  And while you are at it, order some "Kimwipes" since these are better than paper towels.  They are tougher, cleaner, don't "pill" into little fiber balls, are designed to withstand chemicals and not release contaminates.

 

Dan