I use the foil over the screen enclosure.....
when they are blue we spray down the tank 2 to 3 times a day...
humid hide which is filled with moss and sprayed down....
wet towel over the other side of the enclosure...

Now this might be overkill for some...but we live in AZ. I have to add...I cannot wait until I get my tubs as I hear that this is no longer a problem with tubs!!!

Since I have been doing this I have had perfect sheds.....(clearly did not start out like that)