We must specify that we are referring to the cleaning of applied, cured Plasti Dip. To clean up Plasti Dip while you're applying it, just wipe it up with a wet rag or paper towel.
Now, as with most things, Plasti Dip gets dirty. Depending on what it is you dipped, that marvellous DIY rubber coating may need regular cleaning. But no matter how often you need to wash it, Plasti Dip -- unlike any truly great consumer product -- is easy to clean.
A little soapy water is usually enough to do the trick. Plasti Dip is pretty resilient stuff, so almost anything you'd usually use to clean similar materials should work fine.
Tough though it is, there are a few cleaning agents you should steer clear of when cleaning your Plasti Dip. Many thinners and solvents can and will damage Plasti Dip. Petrol will also damage dried Plasti Dip.