The simplest way to clean up Sandstone is using a hot water sponge and stone cleaner. Will not use vinegar, ammonia, lemon, or orange for cleansing Sandstone as They may be abrasive and destruction the surface. All pure stones are likely to have a colour variation. In regards to Sandstone, https://johnnyvdkpv.develop-blog.com/32407440/not-known-factual-statements-about-sandstone-repointing-north-shore