When I first bought the car it had Hydraflush in it and I changed it for LHM shortly afterward. I cannot recall cleaning the filters when I last changed it.
Today I did clean the filters but really I needn't have bothered. They were almost spotless
From that I reckon we have proof positive that Hydraflush is good stuff.
Another strange result is that with new LHM the car stays up for much, much longer. It's a non anti-sink and recently it had been dropping really quite rapidly. It would be on its bump-stops in 20 minutes but now, after an hour it's still not far off normal ride height
I can't explain that one