After washing tapered roller bearings with solvent:

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After solvent cleaning, the goal is to quickly and completely remove all solvent from every part of the bearing and keep it free from contamination before lubrication. Blowing them dry with compressed air while keeping the bearing from rotating is the best approach because it rapidly evacuates solvent from the races, rollers, and cage without introducing rotation that could cause misalignment or damage to un-lubricated surfaces. Spinning the bearing while drying can promote heat buildup, spread solvent deeper into the internal clearances, or cause wear without lubrication. Letting the bearing air-dry in a warm room is slower and may leave solvent residues that could lead to corrosion or dirt attraction, and wiping with a rag can leave lint or fibers behind and may not reach internal surfaces.