mercerized

Recently tried the Sonax wheel cleaner ... What a GREAT product.

Has anyone mixed distilled or DI water with the Sonax concentrate? A sample of the windshield arrived with my wheel cleaner order.
Is DI or distilled water permitted? I seem to recall that VW does not recommend DI is their windshield reservoir.

A few threads regarding the windshield cleaner recommendations. Majority of posts seem to use MB branded.
https://mbworld.org/forums/e-class-w...ld-fluids.html
https://mbworld.org/forums/e-class-w...eld-fluid.html