Most, if not all, of the spot free rinses at commercial car washes are simply filtered water. I've recently seen an ad on TV that claims a spot free rinse but I don't remember the brand. FYI "de"ionized water is everyday water, it is stable and has no charge. Ionized anything is matter that has a nuclear charge normally done by adding or taking away an electron. I love the smell of ionized air in the X-ray cabinet after taking an X-ray when I was studying industrial radiography.
Ionization
