While bluestone patios tend to need minimal maintenance, they eventually will need to be cleaned. If your bluestone surface is dirty, the following instructions will get it clean in no time.
Step 1 - Preparing the Patio
You can save yourself a lot of work by removing as many loose particles as possible before starting a thorough cleaning job. If you attempt to wash a dirty, dusty patio, a lot of your labor will be spent on simply pushing dirt around on the bluestone. You can avoid this problem by using a shop vacuum to pick up any surface dirt. If you do not have one, substitute a broom or even a leaf blower.
Step 2 - Cleaning the Patio
Fill a bucket with 10 cups of water, and mix in 1 cup of chlorine bleach. Pour this mixture onto any noticeable stains and scrub with a brush.
Next, use a pressure washer filled with 1 part bleach and 3 parts water to clean the entire bluestone patio. For this step, you may want to throw down tarps to protect the surrounding structures, plants, or soil, depending on how you use the areas surrounding the bluestone.
Step 3 - Finishing Up
For maximum protection, you should renew the seal on your bluestone patio with a sealer designed specifically for bluestone. Appropriate sealers will be labeled as such by their manufacturers.