Another Q that makes me scratch my head and go, “Huh?”
If your car has “algae” on it, then you’re going to have a lot more serious problems getting it running than you will being able to see out the windows or shine ‘just so’. That is, your car is submerged in water.
Algae don’t survive outside of water. Tterrestrial algae are effectively surviving in an aquatic environment on land. Soil algae survive in a film of soil water.
The other major group of terrestrial algae are those in lichen symbioses. (Quoting from the source I found where I attempted to look up “terrestrial algae”.)
But assuming that you’re talking about one or more forms of moss, lichen or fungus, the first thing you need to do is eliminate the standing water or dampness that they require to flourish. Otherwise any washing that you do will still leave a water source for the next generation.
Your bleach solution will actually work best (after that) if you use it on a sponge and don’t saturate the area with it or allow it to form pools. That is, ‘wipe it’ with a sponge and thoroughly rinse any bleach streaks. (Bleach isn’t about to harm a car’s finish if it’s rinsed right away, only if it’s allowed to stand and concentrate.)