The ’Guru’ is an excellent machine, However, it does benefit greatly from having a surfactant added to the water ( as do all US machines). Without a surfactant and DS, I found the machine to clean ok, but there was still a certain amount of hash, even on relatively clean LP’s.
To this, i am now going to add a vacuum machine to my regimen, as I think the ability to remove more ingrained gunk is better with a manual scrub, and the addition of an enzyme remover is also a plus.