Using a pressure washer is probably a good option for you, but there are certain details that you should pay attention to. For one, you should use an appropriate pressure tip. Using a "zero tip," which creates a small but very powerful stream of water, can erode your stone or brick, and may even create depressions on the surface. A wise bet would be the "15 degree tip," which is the generic type. This will give you a good balance between area and pressure, so that you have enough force to blast off any unwanted stuff on your stone or brick, while not endangering your material's integrity.
Try to stand a little distance from your stone or brick. Standing too close to it would subject it to the full force of the jet of water coming out from your pressure washer. Move the nozzle closer only if there's a particularly problematic area, and do it only briefly.
Chemical cleaners are especially dangerous for brick surfaces. So the favoured method is cleaning with soap, water and a hard-bristled brush. It may seem old fashioned, but you weren't really going for "modern" when you decided to use brick, were you?
You may also like:
How to Prepare Your Fireplace for...
The winter season is fast approaching and you haven't done anything yet to prepare your fireplace. However, you can...
Encouraging Good Cleaning Habits In...
Is there anything harder to do than to get a teenager to clean up after himself or herself? Probably not, unless you...
Basic Steps to Keep your Home Clean...
Everyone wants to have a home that is neat and tidy. It is for this reason that people are allotting some of...