I have a 35 amp power supply and my 150 watt Orion car stereo amp running a sub in bridged mode it would hit the 35 amps easily. The lights on the corresponding circuit would dim immensely.
Normally your game saves are stored under your username you logged in as. Those shouldn't get touched by Ccleaner. The temp files for browsing and windows install junk can/will.
Sometimes the cans are over full and when you use them they actually are spraying a compressed very cold chemical. This can cause condensation but as long as you let the system dry and it is off it should be ok.
I wouldn't suggest DBAN 35 pass wipe unless you have a ton of time on your hands. The 7 pass should be enough for anyone that doesn't have an electron microscope and thousands of man hours to recover your data.