So the other day I got bombed by a bird.
I don't know what this guy ate, but it's poop left a stain on the car that I can't get rid of.
I washed, waxed the car. But where the poop set has watermark look like stain.
Any I idea how to get rid of it?

 

It's probably etched into the paint. I presume you do not have a dual action polisher. Go down to the local auto store and pick up a bottle of Meguiar's Ultimate Compound. Also get either a foam applicator (preferred but rarely available) or a microfiber applicator.

You'll want to clean the affected area, either by washing the entire car or by cleaning the area with a quick detail spray. Put a large dollop of the compound on the applicator and begin working it in. You'll probably have to use some elbow grease. Remember: what you are trying to accomplish is to actually remove a microthin layer of clearcoat and level out the paint. Wipe off with a microfiber towel. Inspect your work. Repeat (and repeat) if necessary.

The compound may leave behind some hazing in the clearcoat (though it usually does not with mine). If it does, then you will want to apply a less abrasive polish afterwards, e.g., Meguiar's Ultimate Polish. This should smooth the paint out for you. Use a different applicator. Then cover the area with a coat of wax.

 

Did u try clay-barring?

 

I had a similar stain on my car and I just sanded it out and touched up the area. I didn't clay it but I assumed it wouldn't work....

 

I experienced the same problem. I used Meguiar's M105 followed up with M205 using my D/A polisher and it was gone. Followed up with a protectant.

 

depending how bad the etch is, i have one on a black car that I might need to use 1000 grit to get off as the most aggressive pad/cut compound would not remove it entirely.