Heat is the hard part since its a kegorator built into an old fridge so all the lines and tap are chilled.
Why would that be a problem? You don't have to worry about putting hot liquid through a cold line. It's pretty tough stuff. I have a crappy old fridge as my kegerator and anytime I blow a keg I:
- clean the hell out of the keg with oxyclean free, rinsing really well
- fill the keg with another round of oxyclean free solution, using very hot tap water (the water heater is set to ~150*F)
- hook that mo-fo up to the line and tap that need cleaning and send most of the keg through the line into a reservoir (usually the big effing bucket I use for cleaning)
- rinse keg really well with hot water, then fill the keg about halfway with hot water
- run that water through the line/tap
- fill keg halfway with cold iodophor solution, shaking it around and making sure to cover every surface inside the keg
- send it through the line/tap, making sure to run the keg empty so the CO2 pushes anything out of the line