I think an offer to clean is a great idea. Also something I heard a pastor say at my friends son's funeral was to send a card every now and then..when someone first passes the family if flooded with hugs, tears, food, flowers, help..but 3 months go by and its less..then 6 months a year the family still remember the loss and everyone else seems to have forgotten...so to send a card or something to let them know you are thinking of them still can be a huge blessing.