Replies

1. 
   Ted W. | Apr 03, 2009 08:59pm | #1

   Powerwashing. :-)

   ~ Ted W ~

   Cheap Tools! - MyToolbox.net
   See my work - TedsCarpentry.com

2. 
   Dam_inspector | Apr 03, 2009 09:00pm | #2

   Try a clorox type bleach on it. I spread it on with a broom, then hose it off. Also scrub with laundry detergent or some other type of cleaner.

3. 
   peteshlagor | Apr 03, 2009 09:03pm | #3

   And then use a topping mix to suit your desire.  Here's one manufacturer's products:

   http://www.miracote.com

   Hit the various links and see what comes up.  Thre's also this:   http://www.concretenetwork.com 

   There should be lots of pictures and links of what you can achieve.

    

4. 
   [email protected] | Apr 03, 2009 09:12pm | #4

   A wash with TSP, and a stiff brush should clean up any oils or dirt on the surface. 

   If it still isn't the color you want, try a wash with dilute muratic acid.  

5. 
   fingersandtoes | Apr 05, 2009 02:26am | #5

   I'd do as Jigsandfixtures recommends. Avoid powerwashing with any kind of pressure as it is easy to take the surface off and then you are ####ed.

   After it's clean and dry for a really nice touch you can seal it, but then you are stuck with having to do it yearly.