riogrande5761
As for pressure washer, my wife and I got a powerful one (3200 psi) and if we use it on the most focused nozzle, it will score cement. So if you try it, try one piece and see how much abuse the track can take if you feel you must take adhesives and paint off.
I use the 40% spread and one pass up and down gets good results. I would say I have had an 80% success rate. It all boils down to what kind of paint and/or glue we are talking about.