I have been wondering about Opti-Clean for domestic cleaning, at a 3:1 ratio it is not cheap but I do like the cleaning abilities. If I wanted to lubrication for cleaning what would be the best dilution ratio. When cleaning a stainless steel sink or fridge door, lubrication is not quite so critical. As an aside, adding some Opt-Clean with ONR (256:1 'ish) seems to flatten the liquid. No idea if this is good or bad, just an observation.