Do not leave in sunlight or use a hairdryer because the heat might cause the plastic to warp or bend.

Take out the keycaps.

Ensure that the keycaps are separated and facing down.

Let the keycaps dry for 45 minutes.

If you cannot wait for 45 minutes, you may use a microfiber cloth and hand dry the keycaps. But be thorough in the cleaning process as there may be excess water inside the keycaps.