i have a 98 corvette that i just got and it has cleaned up real well except for some spots on the rear hatch glass.the spots look like dried wax.i have tried zaino glass polish,clay bar and good old glass cleaner but to no avail.the spots are in the top aera of the glass where the antenna matrix is so no steel wool..i cannot feel the spots with a sandwich bag over my hand or with my fingernail...thanks for any help......... :spot