wolfkinara, it's not so hard as it seems. I do high pressure washing of my backyard pavers, maybe once per month, maybe less often, cause it depends on certain season of the year, you know. I like to use Color Enhancer sealer ( from this website: https://bestyardproducts.com/best-paver-sealer/ ) and the simplest high-pressure washing machine. I like that after it natural color of pavers and some natural stone elements becomes more enhanced and much brighter.