Brownstone is softer than it looks
Brownstone is sandstone, and it varies a great deal from one building to the next. Some stone is dense, while some is soft and flaky, with surfaces that have already lost their skin to age and old repairs. High pressure can strip what remains and leave pits where water collects and freezes.
We start with the gentlest option, a low-pressure rinse with a cleaner chosen for the stone, and test a small hidden patch. Painted ironwork needs different care, since flaking paint comes off in sheets. In some historic districts, facade cleaning methods are regulated, so owners should confirm requirements before work begins.





