I am replacing my Poptop seal and wanted to know the best wayt to clean the surface.  The previous owner Siliconed the poptop seal to the hardtop and I want to remove and clean that before I put on the new busdepot one I got.  
 
I was thinking of using some rubbing alcohol to remove the rust stains from the previous seal and the silicone.  
 
 
Any suggestions would be appreciated.