Preferably, I would like to hear Dr. G's take on this one.
So to raise money for a good cause, and test the products, I washed cars in my village, using ONR, OCW, OPC and the UBS. Naturally, most of them are neglected. It's been hot as well, and bird poop (which people don't even remove) is the name of the game over here. Bad combo that is.
I soaked the bird poop with some ONR wet towels, before going over it with the sponge and the towel. Most of the poop came off with a bit of extra effort.
What I found was, that bird poop left incredibly visible marks on the paint. Everything was off of the paint, but it was very clear to see where the poop was. I feel like, that an automatic car wash would have done a better job in removing those marks. Wouldn't be so strange either, since the car is blasted with strong soaps and beaten to a pulp, you probably can't expect ONR to get the same kind of clean. On regular road grime though, it leaves absolutely nothing to be disered, even on neglected cars.
So my question is; what could I improve on to decrease those bird poop marks? Maybe spray a little bit of Power Clean on it beforehand or after the gunk is gone? The idea being that doing so, I remove the remaining acids on the paint.
Cars just get washed too little. In a perfect world, everybody would ONR their car every couple of days. Just takes maybe 15-20 minutes. Or at least remove the bird droppings. Oh what a world would that be.