Sap should come off if you just scrub it really really hard. Try using a razor blade and some don's or goo-gone if needed. The razor blade won't scratch the windshield.
You'll need a petroleum based product like WD40 or Goo Gone plus elbow grease to remove the sap. Avoid using WD40 on car paint, though.
To remove tree sap from your car, you can try using rubbing alcohol or WD-40. Apply a small amount to a soft cloth and gently rub the sap spots in a circular motion until it dissolves. Be sure to wash and wax the area afterward to protect your car's paint.
Lick the sap off of the tree.
A bad relay switch will cause the windshield wipers to not turn off. Replace the relay switch and the windshield wipers should turn off.
lick it.
There is no pencil plant. Any sap wipe off.
I have used baking soda to get it off my windshield, but it takes a lot of elbow grease to do it. Use a damp rag and sprinkle a good amount of baking soda on the surface to be cleaned. As you scrub, you can feel when it comes clean. (It won't work without the water - if your rag dries out, get it wet again.) Then rinse to get the baking soda film off. I believe you can use it on the painted surfaces, also, as baking soda does not scratch. However, I am still looking for a faster way to get the sappy film off because my whole car is covered with it!
Wet a rag or small towel with warm soapy water and put it on the sap and let it soak. Once the sap softens, just wipe it off.
Six to nine months, usually. Giving the rubber blades a quick rub with a rag dampened with alcohol will stretch their usable life - a little. You can also extend the life by keeping bugs and sap off the windshield. Finally, keep your car out of direct sunlight too...that helps tremendously.
Sap should come off easily be cleaned off with mineral turpentine, engine degreaser and sometimes methylated spirits. If the sap is hard try scraping it with your nail. If you do use one of these, wash the area off afterwards as there are some products that, if left on for long, may damage the paintwork. If you've mistaken tar with sap the tar should come off with eucalyptus oil or one of the above. There are car parts sellers that you could ask and they will probably have a product that leans off sap and tar.
There is no answer because its a metaphorical question/phrase. So, is it better to be the bug or the windshield? I say its better to be the windshield, because you have have windshield wipers to wipe the guts off of the windshield...