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The Gunk engine degreaser will work, but it's potent stuff and will burn your nostrils and irritate your skin after a while, so you don't want to make it a habit of using that stuff as a grease cleaner around the shop. Any carb cleaner should work OK, it's just that I think Berryman's works the best, solvent-wise. Brake cleaner is another very good cleaner/solvent, but again the fumes and chemicals can cause iritation if you use it for too long too often.
Wipe off as much grease as you can first and then almost any solvent will work. I personally like to use WD40 since it works, it doesn't irritate my nose or skin , it is pretty safe and almost everyone has a can.
Brake cleaner and engine degreasers also work fine but can irritate.
A bearing and it's race should be almost spotless except for grease even before you clean them. If they require a heavy duty solvent to clean them, something is wrong. That is why I like WD40 works good an doesn't hurt anything.
BTW, don't spin the rollers with compressed air to dry them. They can be damaged by spinning at high speed with no lube.
I just use ordinary paint thinner (naptha based) as a general cleaner around the garage. Yes it is flammable, but not low flashpoint like gasoline or acetone. It is less likely to poison you than some of the more exotic cleaners, like brake or engine cleaners. Read the label warnings or MSDS. One of the "professional" products, whose initials are SK, can cause liver damage.
I use ether, or contact cleaner as a final cleaner, it leaves no oily residue
Timken bearings says oil resedue prevents proper adhesion of the grease, and bearings should be free of everthing but grease. I build high speed milling and drilling spindles for a living, they don't fail till the seals go bad, and moisture or dirt get in
I use gasoline or kerosene with a parts brush. Final cleaning is with brakleen and air. DO NOT SPIN THE BEARINGS dry!!!! You can damage the bearings. I prefer Kendall blue grease when I repack em (once a year folks). Don't forget to build up a dam or well behind the bearings in the hub, to assist the bearings in retaining what little grease they have. Just don't go crazy and fill up the hub with grease. I use a rubber spatula to get the grease in behind the races, for added lubrication.
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