Cleaning circuits

A few questions about clean(ing) circuits: a)Can dust cause any damage to a PCB? Can it short anything? b)What do you recommend for cleaning out PCBs if there's lot of it, or spiderwebs, mold whatever? c)Does distilled water cause rust? d)Can distilled water be used to clean circuits? e)As I understand, tap/spring/rain/etc. water is full of minerals and that's why it's conductive as well as rust-causing f)A while ago, I picked up a bunch of 5.25" diskettes, which I hardly allowed to dry before I put them into the plastic box. Now I looked inside, and mold is spreading from the Microsoft Assembler diskettes onto the Apple II ones. What is safe to use to clean the mold (it's reeely disgusting!)? ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com