I don't have any experience in cleaning tile, however I would try using hot water power washing before I use a rotary nozzle. rotary nozzle would be the last resort.
-- Edited by Walk on Friday 11th of December 2009 05:45:51 PM
Caleb, sorry to see you had a sh####ty time with that roof.
I learned a long time ago in other businesses that as the "expert" you have to know when to say "No" and walk away before you start, It sucks but everything has it's limitations.
Hope you get the job done with out doing too much $$ If I lived around the corner I would give you a hand, but we are a bit far apart for that.