pickles said:
Sounds like oily residue that the car wash or detergent won't shift.
Try a good quality car polish like autoglym or Mer
I've used Mer and top be honest I think it's pants. It's dead easy to put on but it's very easy to come off too - it doesn't last 5 minutes. Autoglym is a bit better but if you want a long lasting shine then you need to use something that's hard work to put on like Simoniz Original Wax. You can ruin a Sunday morning by putting this stuff on you car but you only need to do it once about every 9 months so it's well worth the effort. As the saying goes - there's no such thing as a free lunch. You only get out what you put in.
Obviously now I have a Tranny, that doesn't get polished at all - you treat em nice and they s**t on you!
Gcol
Agree with you about the Mer, much over rated, but I swear by autoglym. You can see the rain beading up for months, Simoniz sounds too much like hard work. I once had a really good polish in a spray and can't remember what it was. Iv'e been buying endless bottles of crap ever since trying to find it again
p.s. to remove the stain, try white spirit or meths, then polish (but not with Mer)