Chuck,

I too also used to use New Again, till I found Northern Tool Roof & Deck Cleaner. Same formula, $9.99/gal or 5 gals for $45.

Having said that, I now use mostly Renew for decks and Roof Bright for roofs. I downstream the Roof Bright and use a backpack sprayer for the Renrew. The Renew is about $3/gal when mixed (and you can vary the strength) and the Roof Bright is about $4/gal. Both prices include the shipping. Northern is local, so no shipping.