I put the PIAA blades on all of my rides and have always done the following for installation:
Clay windshield, clean any detail spray residue off with glass cleaner, apply PIAA silicone packet to windshield, let sit for 10 minutes, clean glass again with glass cleaner, run the wipers at a low speed for about 5 minutes on a dry windshield (per the instructions) and then you're done.
For maintenance after you have them installed I follow almost the same method. Clay the glass, clean the glass with glass cleaner (to remove any DS residue), seal the glass using the amazing Adams glass sealant, then if I'm feeling frisky I'll top it off with BG