220v and PDP 11 cards

This is for those folks out there that have the big iron, specifically, anything that uses 220v. If your machine is at home, and assuming you don't have a seperate dedicated 220v line, what are you using to power your machines? Do you tap into the oven/washer outlet? Just how high did your electric bill increase by? Any other suggestions? I recently picked up a box full of PDP 11 cards. Is there a site that actually describes what the cards do (vs simply a terse description of what the card is e.g. DR 11-C Interface). There were also some blue cards from a company called MDB (DR11C, 11W?, MLSI DRV11C, etc). What type of boards were these? And lastly. Several of the above boards are in sad shape. They were left outside so now there pretty dirty (as in literally having dirt crusted on them, along with leaves and dead/dried critters), any suggestions on how to clean them up without ruining them. Thanks George