I have been running the same VAT for almost 2 months now. It's not seen constant usage, but it's the longest any VAT has lasted for me. When I start to see some clouding on the PDMS window, I use a little bit of acetone and a lens cleaning paper and wipe it off. It has done a fair job of cleaning off the surface layer of film that has built up.
I created this block that I use to hold the tray up at an angle when not in use. I have found though that it's not Poke-a-yoke and other users put it in place in all sorts of ways... maybe a future rev.
It also will likely not work so well with the 'new tray' that I hear is coming soon.
PS - what's the best way to share the tar.gz file?