How to clean off spray adhesive?
Always make sure to test any solvents on a piece that you don't mind ruining first

Man-made fibers and plastics can interact quite unexpectedly with solvents. Since most 3M spray adhesives aren't water soluable (per the MSDS), solvents are going to be the trick for removing overspray.

PerfectFit.com has some good suggestions:


  Removing overspray. Adhesive overspray is always better prevented than
  removed. But several common solvents can help clean it off, including
  mineral spirits, turpentine, citrus-based cleaners or 3M™ Adhesive
  Remover. Be sure to follow proper precautionary measures when using
  solvents!
  
  
  On hands, apply baby oil, cooking or vegetable oil, followed by soap and water.
  On furniture, use a furniture polish.
  On fabrics and carpet, first remove as much glue as possible with masking tape. Then dab the surface with a cloth dampened with one of
  the solvents listed above. 
  Or spraythe surface directly with 3M™ Adhesive Remover or a citrus-based cleaner.
  
  
  Always test solvents and cleaners on inconspicuous areas of fabric or
  carpet first.