Art Oliveri
Roundtable Host 2009
I have always had good luck using Safe Restore/One Restore for many years now.
Not sure you can use it on siding like One Restore
Prosoco Sure Klean® 600 Detergent is a general purpose, concentrated acidic cleaner for brick, tile and concrete surfaces. 600 Detergent dissolves mortar smears and construction dirt quickly, leaving the masonry clean and uniform with no acid burning or streaking.