I think I did hear or read it somewhere that dish washing liquid is great for car wash, never try it out yet.
Remember that class action lawsuit against contact eye drops which retails for $8 in a tiny tiny tiny bottle, but has the same content as $1 for 12 fl oz saline solution? It was proven beyond doubt and solution makers lost. You know what? when I talked to poeple about it, they still don't believe it and insisted eye drops are different than simple saline solution.
That does NOT mean you can use dish washing liquid to wash Hummer, but it could be true.
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