bling bling
What I would use most are afraid of b/c of all its hazards.I would use a weak HF acid mix followed with soap wash.I use a alumu. brightener that has HF in it but its not epa friendly,don't want to go into all that.I washed 4 2388 case Intl. combines today and I have washed them for 3 years,he told me today he was going to trade them off but hated to b/c they still look new.The alumn. brightener does a great job in cleaning plus it helps shine the sheet metal plus I apply wax.Also the HF acid it will do damage to glass.................C-ya
Sorry---I would make sure no acid would get on any windows or shurbs,apply acid with downstream from bottom to top of ridge,pw wash off with upstream soap,doing one side at a time,rinse with wax.If its hot and drying fast do 1/4 at a time,you don't the acid to dry or you will have to reapply.
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When In Doubt,,,,Think It Out.