I have been waiting for someone to answer your question as I'd like to know the answer to use myself. Have you posted this question on the cleaning or gardening forums? People who garden have a lot of brick that mildews and may have the answer. If you get an answer, would you come back to this topic board and post it? Thanks

There are some pretty good anti-mildew products out there, including one that I have seen work well for composite decking (it's on Trex' website which is how I found out about it) called Anti-Growth. I think that would work on the brick as well - it doesn't leave a film or anything.

Its completly with in reason t=Junk would have a product like that on their site. I am thinking the double clicks require extra bandwidth and a new service pannel. John