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Bob Heine;32852 said:The real test is to wash something with Fairy and rinse it off. If the rinse water sheets and doesn't bead up, you should be good to go. That's pretty much what Dawn does. If you check out the detailing sites, they warn against using dish detergent to wash your car because it strips off the wax and leaves the paint vulnerable. Pretty much exactly what we want to do to prep for painting.
I finally got a chance to test the Fairy liquid last weekend. It did indeed make the water sheet off. I wasn't quite sure if I was doing it right, I know I didn't use a good cloth to wash it with. It was clean but wasn't a good choice in material. Will try something different next time and will also spend more time at it.
crashtech;33848 said:If I may add something to this, it would be to do as Bob suggests, then dry it with clean paper towels and paint it. That is what will tell you how truly free of contamination the surface really is.
After I washed with the Fairy liquid, I let dry and then used a wax and grease remover with a new microfibre cloth. I followed that with a new tack cloth. I did get some obvious signs on the microfiber that I hadn't washed it well enough. It was aluminium I was preparing for painting.
Just to be sure, you say to not wax and grease after washing and drying with clean paper towel?