This is my area of expertise. My method is extremely close to what

described. I will give you a step by step.
1. Shut off the gas and stand your trike up on its grab bar (remove fenders on most models).
2. Hose the bike down to get the big mud off undercarriage and skid plates
3. Cover entire trike with 50/50 Wisk/water mixture from a pump sprayer (Roundup pumper works well)**
4. Light a smoke and drink a beer (~7 minutes).
5. Rinse trike - set it back on all 3 wheels
6. Repeat steps 3 & 4.
7. Air dry if its hot and sunny, otherwise use leaf blower to dry the wheeler.
8. Generously spray all plastics, rubber, lines, hoses (not the seat) with Armor All - no need to wipe it off, it will dry.
9. Spray all metal components with WD40. Especially kicker, all springs, insides of cables, and motor.
10. Finish 6-pack while and admiring its beauty.
Start to finish this process should take 30 minutes. Remember, the beauty of this is that you never touch it with a rag, sponge, brush, etc. The WD40 will remove oxidation and make your motor (especially unpainted ones) look MINT!!
**Special thanks to Ditchmud for spreading the word on the "Wisk trick." Any laundry detergent will work, but Wisk is the most expensive and hardest to find - doesn't your trike deserve the very best??