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We have a nice bluestone patio in the back yard. It gets dirty, from leaves which fall from nearby trees and then don’t get immediately swept up, from general wear, from NY dirty rain etc….

How can I clean it? I tried a stone cleaner (three bottles of it, actually, though it’s a large patio), which I used less dilute than recommended, mixed with warm water, left to sit on the patio for 20-30 minutes then scrubbed hard with a brush and rinsed off with the hose, but it didn’t help all that much.

Does anyone have any cleaning substances or techniques to recommend, or a company which would do it for me?

Thanks.