On Jun 7, 10:38 pm, wrote:
In article . com,
says...

Concrete doesn't decay.

You've missed all the threads over the years about trying to keep a
concrete patio/driveway/sidewalk looking reasonably clean and new?

--
is Joshua Putnam
http://www.phred.org/~josh/
Updated Infrared Photography Gallery:
http://www.phred.org/~josh/photo/ir.html

IMHO deck obsessors outnumber driveway/patio obsessors by a large
margin. FWIW, my nifty patio gets hosed off every few years (in the
midwest here) and looks just great after nearly 20 years. Most of the
threads in this NG relating to concrete cleaning problems are the
result of easily avoided owner disasters and sometimes sloppy
contractor mistakes. So there!