i use a product called Griot's PaintPrep. i dont use dawn or any dish soap.
in my case after washing the car (or QD), i mist the panel with water, then spray paintprep, followed by another mist of water and wipe off with a soft MF towel. it completely removes any sealants or wax. i do that panel by panel as i polish or wax/seal the paint.
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