Last time I erected my Carls 16 X 9 BOC I noticed a significant amount of mildew spotting - looked like one of those ink blot psychology tests
.....This was the result of a hasty tear down with the screen being packed away while still a bit damp.
Yep, been there. It had rained all night but I thought my Carl's screen dried out enough the next day. It wasn't obvious that it was still wet down inside the folds of the black border. After rolling the screen up that moisture wicked out of the border onto the white screen. I ended up with mildew spotting along a good portion of the lower border edge.
I didn't take any pictures as I didn't want to draw further attention to my less than pristine screen on this forum. I certainly wouldn't have used it anymore unless it could be cleaned so I took some of the advice. Added 2 cups of a beaching agent to boiling water, a clean long handled brush. It was like magic watching the spots disappear and when I hosed it down after 5 minutes it looked almost brand new. I had actually put the screen up in its frame to do the job and left it up for a good long time to dry out.
Now I have an almost pristine screen again and am super pleased with the advice posted. I certainly won't be putting the screen away damp again and can now show our big New Years Eve showing without concerns of a nasty screen.
If I could trouble you with a few questions...
Where did you hear about using boiling water? Did you wash down the entire screen or just spot clean? If the latter, did the bleach solution then make the cleaned areas stand out as brighter/whiter than the rest of the screen? Thanks.