Hello Recordsguy and good afternoon to you. IME, steam cleaning. I use a Soniclean handheld steamer that was special ordered from Home Depot for around $50. Just be sure to keep the tip about 3" from the LP and try not to let any drips hit the LP at all. You want pure steam. I use the direct steam tip with no hose in conjunction with the RCM, FWIW.
Tom