Yes. Take 3 ounces out of a gallon of water, add 1/2 oz of the product.
edit: I think that`s close to the same ratio as ONR. 1:256
That`s the rinseless dilution, they don`t technically list a waterless ratio, but it should be similar to diluting it for QD, which is 1:16. Waterless works much differently than rinseless with the 8 or so products I`ve used. If it`s effective @ 1:256 as a waterless, you should be able to use it at least 1:1024 as a rinseless. And that doesn`t make sense to me.
*UPDATE* Just read Optimum does recommend 8oz per gallon for waterless, which would be 1:16. Fenlab`s info has to be incorrect. Waterless @ 1:250 wouldn`t clean much of anything, you might as well use straight water at that point.