having brought a second set of apexs which i had refurbished and are now fitted to my car, had the originals for a good while and still have some infact, but never had any trouble with them other than the idiot driver (me) kerbing them, never again tho.
I used to regularly pressure wash them and use wheel cleaner on them, and never had any problems. once cleaned inside and out of the wheel i often apply brake dust polish that stops it sticking to the wheel and use normal clear car polish on top of that for added protection against the effect of brake dust.
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