Hi Guys.. Came back to my white O3 wagon the other day after a few days away. There  were some yellowy bird poops or sap marks on the horizontal part of the bumper.I cleaned off the solid parts but no matter how hard I try,I can't get rid of the yellow marks.Any ideas? 

Hi Guys.. Came back to my white O3 wagon the other day after a few days away. There  were some yellowy bird poops or sap marks on the horizontal part of the bumper.I cleaned off the solid parts but no matter how hard I try,I can't get rid of the yellow marks.Any ideas? 

what have you used to clean the paintwork?

maybe a clay bar or similar deep paint cleaner would work (something like  http://www.meguiars.com.au/surface-prep/deep-crystal-paint-cleaner/)

I tried a bit of Turtlewax,no go.I even tried a tiny bit of Autosol.Wouldn't shift it 

Hi Guys.. Came back to my white O3 wagon the other day after a few days away. There  were some yellowy bird poops or sap marks on the horizontal part of the bumper.I cleaned off the solid parts but no matter how hard I try,I can't get rid of the yellow marks.Any ideas? 

I have x1 spot like this on the horizontal part of my rear bumper IIRC passanger side, nothing seems to move it.

You maybe better asking the question in the "styling and care" section, there's lots of Semi-pro and Pro detailers on there who will probably know the answer.

Clay bar and Meguiars ultimate compound should remove it. I've found this removes greasy hand marks from cars when nothing else will.