heck, MOST soaps have a rinse agent (like Jet Dry) that'll kill your head retention.
your local bar/pub/tavern uses a special cleaner on all their glassware to avoid this. You can too, or you can use a saltwater solution to rinse your glasses after washing, which will remove the rinse agent and any soap residue.
Primary: English Mild
On tap: Pale Ale, Lancelot's Wheat, English Brown Ale, Steam Beer, HoovNuts IPA
Bottled: MOAM, Braggot, Raspberry Melomel, Merlot, Apfelwein, Pyment, Sweet mead, Cabernet
Gal in 2009: 27, Gal in 2010: 34, Gal in 2011: 13, Gal in 2012: 10