Try black stockings over the area, or attach some PVC piping, black of coarse, like mentioned, then put black stockings at the ends, this helps block out light, along with dust from coming into your intake.
I am researching some different ways to store clones, will let you know if I have any suggestions for you. At this point I have just put a clone in a glass of Super Thrive and water for about a week and it stopped growth and stayed healthy, and now it is planted and rooted.
Adieu