Noremac:
I’ve been using a spray with water and detergent and an old towel to buff off. Tried the squeegee part of an ice scraper, but takes a while and doesn’t work well on the curved mirrors. Disadvantages include a dirty towel needing to be washed.
Try one of these Noremac, those are soft silicon blades, reversible and come with 2 spares, so you have 6 useable blade edges.
Been using one for over 2 years now and just turned the first blade around, give the best clearing sweep of any squeegee i’ve had and i’ve bought lots of rubber bladed things over the years.
Amazon is the only place i’ve found them, haven’t seen them on ebay though can’t say i’ve looked recently, buy now if you’re going to get one because they’ve been unavailable for a long time, i’ve just bought another in case the handle breaks, which unlike most of these things itself is sturdy.