A tip that I found out by accident one day but can be pretty handy.
If you put a liquid disconnect on a keg that's around half full, with a few metres of beer line, then tip the keg sideways any liquid in that keg will start coming out of the line. Now if you keep the bottom of the tubing below the keg the liquid will still come out (same affect as siphoning basically).
It's a pretty handy way to ensure that you have a volume of cleaning fluid going out of your keg through the dip tube without needing to use pressure etc.
If you can have the keg high and drain it into a second keg the opposite way, even better. Cleaning the dip tubes of both kegs in one go.
You can walk away and forget about it too so pretty convenient.