There are only two remedies. First one would be a little off the wall. Break the interior layer of the glass and remove it. Wash the glass and be done. Not the best idea. Number two is to order a new window unit from the manufacturer and have it installed. Sort of the price of doing business in this RV hobby....
Jim and DW 48 years Brenda
2017 38rssa, also a 2015 Salem (for Alaska)
2019 F450, ruby red
Harley Road King & sidecar