If you want to clean bugs off your car, do this:
1) Half fill a spray bottle with warm water
2) Insert 1 or 2 fabric softener sheets into the bottle
3) Let soak for 5 minutes
4) Spray on car and let sit for a few minutes (not too long)
5) Scrub* with the fabric softener sheets
6) Rinse off with soap and water
*There really isn't any scrubbing. I was amazed how old bug stains wiped away effortlessly.
I've tried this and HIGHLY recommend it. Easy as pie and the results are phenomenal. Just be prepared to learn that some of those "bugs" were actually stone chips and no amount of scrubbing will make those go away! There's no damage to the car paint but I make sure to rinse with soap and water just to be safe (I wouldn't trust using the spray and leaving it to cook in the sun).
You can also find YouTube videos on this.