When you clean inside windshield you need quick cleaning and deep cleaning. You can use a bar of detailing clay to deal with any grime and grit lodged into crevices. A typical one weighs 3 to 3.5 pounds.
A car wash solution with a polishing recipe that you can practice without difficulty is exactly what you need. Do-it-yourself car wash soap is cheaper, safer, and gives you greater control over substances to meet your specific needs.