Q. Dear Rabbi if my glasses fell on the mud while in the cottage and the mud became dry can they be washed on Shabbos? Does the same apply to a window?
A. Horav Aharon Miller Shlit'a maintains that the glasses are not different than dishes and if needed for Shabbos they can be washed. The same would apply to the glass of a window if it is needed clean during Shabbos.
Rabbi A. Bartfeld as revised by Horav Dovid Pam, Horav Aharon Miller and Horav Chanoch Ehrentreu Shlit'a.