I will DISAGREE with Rivets, DO NOT USE A PRESSURE WASHER ON YOUR MACHINE !!! you will get water in places that will do unseen damage in due time. the spray de-greasers you mention will work fine, provided you cover the fuel system components, oil fill tube area,starter, with plastic wrap/ bags and any other electrical components that you think is necessary (the wiring will be fine) just do small sections with a brush and the spray, use a SOFT flowing stream from the garden hose ( NO NOZZLE ) use a leaf-blower or air hose to dry it off as much as possible, you can buy A/C condenser cleaner ( spray-can) in most hardware stores or at an A/C supplies center use that (according to directions) to clean the oil-coolers repeat the soft water treatment, after unit is dry, run machine till thoroughly warmed up, shut-down unit, let it cool off, then spray with W-D 40 wipe excessive amounts with a rag, onto the whole machine area that was washed, lubricate any grease fittings, be careful with chemical cleaners use EYE-PROTECTION, and some cleaners may discolor or stain paint if left on for extended periods without washing it off.