One more question: how much solution do you spend to pre-spray/pre-soak a mid-size sedan? I'm going to buy Marolex sprayer but don't know whether I need 1L or 1.5L version.
With Ech2o, what dilution do you use for pre-splay/pre-soak, assuming this is not a "true" dedicated rinseless wash? Same dilution as rinseless (1:200) or something more strong?