paint problem need help please

The paint was hard within a week. When i mentioned being able to dig my nail in, it was after pouring very hot water on the hood and I was washing and tried to dig a little at the contaminated area. I t almost felt like I could scrape off the contamination but I worried about wrecking the clear.There was nothing wrong at all with clear until I let the car sit out under the trees for a couple of months.I am guessing with all the studying I am doing that the sap,dust etc sat on the car got wet and dried very hard?

Try a clay bar. best way for removing grime off of paint without damaging the paint.

If that doesnt work you'll need to try a extreemly fine cut liquid polishing compound. Meguires makes some OK stuff that's easy to get. 3 stage liquid polishing set, higher the number rating on it the finer the cut. If that doesn't work you'll have to cut and buff. If you haven't cut and buffed before id leave it to a pro, its easy to completely trash a paint job very quickly if you dont know what your doing