What about www.guttersouce.com
<DIV STYLE="filter: glow (color=blue,Strength=8);width:540";><font size="7" face="arial" color="ff0000"><b>Come on Mike its the best gutter BBS on the web!!!!!!!!!!</b></font></DIV>
Here is a partial list. http://www.adpub.com/links
Click on "Forums & Chat" on the left side of the page.
Also, if you have a BBS or a pressure washing related website and it is not listed in it's catagory, click on "ADD YOUR WEBSITE", fill out the form and click submit.