Lesson learned today. Must wash and wax panel by panel. Should not rush into completion. Preferably, manually wax and buff off rather than using oscillator. Though it is faster to use oscillator, guess it is neater to be manual. And, 1 most important step, that is , use of claybar to remove contaminants during car wash. I have miss out this particular step.
It is not so useful to use the water hose at a HDB MSCP water dispenser. The timer will cut off the water, hence, little water is available. Maybe I should shorten the hose more. That will reduce the length that the water need to travel. Here are some pictures of using 3M wax.