How do I keep my hardtop from fading?

How to keep the color in shape?
It is fading from sun
Wife got some UV protectant she found on Amazon for the bottom of the kayaks that spend the summer upside down on the dock. It definitely works, may be worth a try. I don’t know the name but she has bought it more than once and found it every time.
parked in garage.
all day
and work night shift.
x2 who washes a jeep?

there are UV sprays, but needs endless re-application.
even the black bumpers fast,see mine?