Many words - I know I should have taken pictures. Work on a cloudy day to wash the top , your top is black so will dry fast in the sun. Wet the car top and the whole car , spray cleaner on and use soft bristle brush - (horsehair ,Mustang,pony? Lol) to clean the top . You may have to do several times. Rinse well - rinse again - and again. Once top is dry - now the sun works for us it’s time for the protectant .
I spray the protectant when the car is inside the garage so I don’t have to worry about the wind.
I opened the car windows about 1” and released the top latches and put a 2” block to hold the roof open a bit and put some old blankets over the windshield / hood under the unlatched roof, through the side windows over the doors and across the trunk to keep the overspray off the rest of the car. I taped up the trim around the car / roof as well to allow me to get good coverage at the bottom . Spray light coats - alternate directions between coats, front to back, then side to side to get better coverage , let dry 15+ min between coats. I may have went a bit heavy as I just got 3 coats from the can .Clean the spray off the windows or trim before it dries each time . With the roof released the fabric is not tight to the trim so you can get the normally hidden places treated as well.