i think i know what you may need...
i bought my car from this jackass that left the car out next to sprinklers and in the sun....so everyday the car got sprinklered on and then dried in the sun...so i got hard water calcium deposits all over the car...
you should try and use a paintcleanser...
something not tooooo abrasive that will take the clear coat off...but will clean off the ish you have on there....
also if there is oxidation you cant use a paint cleanser because it will take the remaining paint off...
i will give you the name of the brand i used later....its at my house...and im at my wifes house right now...