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If he doesn't like the ball then that's fine as you really don't need it, balls don't offer any benefit to hams, either buy or make a playpen for him so he can have out of cage time with toys to explore & you can also interact with him in a playpen.
Peeing on the wheel is quite normal for some hams, the more you clean the more they do it, just give it a wipe down with a damp paper towel or if it's really bad wash it with plain water about once a week.
It's not unusual for them to want to interact more on some days than others, just let him guide you & spend more time with him when he's in the mood for it.