"Phisherman" wrote
I have vinyl siding and a 3-story house. Algae and dirt needs to be
removed (a bleach/detergent mix works fine). What kind of extension
pole (about 20 feet) could be used?
==
Check for a swimming pool telescoping extension pole. I have
a 33 ft pool and mine reaches almost the length. You can get extra
extensions and brush heads for them. Here's
an example:

http://www.intheswim.com/shopping/pr...x?productid=71