Dish soap is fine and very effective for removing old wax. It won't damage your paint, just leaves it exposed without the protection of wax. Obviously not something you want to use regularly.
To remove iron deposits, I would try using aquartz iron cut before claying. Works great, but you can't let that stuff dry...and it smells like rotten eggs.
Also, clay bar works great on glass too.
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[09][MB][6-Spd MT][Touring][Stillen Gen III][K&N][Borla CBE][Evo-R]
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