Windshields are part of the structure of that car. Cheap not always best. Installation takes heating up the sealant and letting the whole installation cure. Mobile installers whco come to your house or work probably don't allow for that or use less effective alternative techniques. Also the windshields themselves need to be carefully made. Avoid cheap Chinese windshields.

Use NuFinish to polish your windshield.

Yikes!

Ethanol is common additive, but should not be more than 10% or can damage the engine. You can buy a device to measure ethanol content.

When jump starting car, let the running good car charge the dead car for 10 minutes, then turn OFF the running car, then try to start the dead car. Don't keep the good car running while you try to start the dead car--that could mess up computers, etc.