Concrete that has been around for a long time will start to lose its original color and become much darker than it was in the past. It can be extremely hard to clean if you do not know how to go about it properly. Slurry blasting is a technique used with a high pressure burst that effectively eliminates all that grime and dirt that has built up over the years. Slurry blasting is also the method of choice when it comes to removing paint off larger concrete surfaces.
Slurry blasting is recommended for cleaning these materials because it gets the job done and mitigates much of the dust and dander that comes along with ulterior methods. The moisture and force of the slurry blast takes care of all the particles that would otherwise be in the air. Use the internet to find more information about this effective cleaning technique.