One thing I like to use in addition to the purple cleaner is one of those siphon sprayers that runs off an air compressor . After spraying down the saw with the degreaser and maybe a little parts brush work I'll rinse the saw with clean water in a gallon jug for the sprayer. It is like having a mini pressure washer only you don't have as much to set up . Makes quick and easy work to clean a dirty saw.
I have done that with saws too. Load it up with mineral spirits and blast the crud right off.