Engne cleaning question

Try Purple Power from Wal Mart or the auto parts stores. Works better for me that the degreasers. You can help it along with good brushing, stiff round brush or cut down a paint brush. Can hit it several times, spray it, let it soak, brush, repeat. Garden hose pressure works, pressure washer works better but can easily get into the electronic stuff so you have be more careful. The garden hose can be more forgiving. Keep away from the distributor and alternator you can duct tape a plastic bag over the dizzy cap if it makes you feel safer. Good Luck