Lichen on roof shingles

[DAVID WILLETT]

I have a problem with lichen growing on my asphalt roof shingles and am 
looking for a simple solution to remove the growth before physical damage 
results.
I have considered using a weak solution of Javex but I'm not sure if that's 
the answer.
If anybody has any suggestions, I would appreciate an E-Mail message to the 
following address:    WILLETTD . DAVID @ ISTC . CA