Just replace them with good quality bearings. No point messing about trying to rejuvenate simple cheap service items like bearings.
Do your bike a favour and fit an SKF bearing, spacer and seal kit. They are many times better than oem for all makes of bike. Top quality with a patented seal that has a rotating collar that sits against the spacers. They are designed to reduce friction and be better resistant to pressure washing. The rotating seal doesn't wear a groove in spacer and make a channel to let water in.
The friction reduction can be felt when you just push the bike along.
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