Moisture in the face plate

take the back off and place it on inside of the house windowsill, this hot, sunny dry environment will speed the drying process, it may take a few days.

You need to remove the back plate and leave it sit in a warm, dry area for 24 hours to allow the moisture inside the watch to evaporate.

Best thing to do is remove the back and let it air dry for a few hours or until the cloud is gone, but it means your back or stem gasket needs replacing. You can use a hair dryer to speed the process. Keep an eye on the heat.

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The most common failure of a watch to be water resistant is caused by a faulty contact between the case at an opening around the glass, crown, or pushbutton and the opening's gasket. Worn or defective rubber O-rings are often a cause of failure. Condensation forming under the crystal of a watch following a sharp temperature change (a swim after a stretch in the sun, for example) tells you to have the watch checked without delay. This can be an indication of additional moisture elsewhere inside the case. It is also the only water-tightness check a consumer can perform.
Of course non-water-resistant watches don't contain the additional seals and gaskets found on water-resistant models. Consequently, moisture-laden air can easily enter the case. Once inside, a pronounced change in temperature may cause condensation to form under the crystal. Very little can be done to prevent this. A high-quality water-resistant watch, however, properly serviced and maintained, will be sealed to prevent internal water damage and will more than outlast an ordinary watch.
To keep the watch properly sealed, replace any defective parts , such as gaskets, crystals, and crowns. Water-resistant watches should be tested for case tightness at least once a year, as well as every time the watch is opened, such as when a battery is replaced.

Step 1 - Minimize the Moisture If your watch is exposed to moisture or falls into water, the first thing you want to do is move it to a dry location. Dry off the water on the outside of the watch with a soft rag. The glass on the front can be easily scratched, so be sure to use a soft cloth to wipe clean.
Step 2 - Remove the Cover Open the cover on the back of the watch very carefully. Often a small flathead screwdriver will help in turning the cover. Pour any water out that remains. Be careful not to touch any of the gears or parts of the watch as the watch may become irreparable.
Step 3 - Air Dry Lay the watch face down in a warm room to allow it to air dry for at least 24 hours. After replacing the cover, the watch will often return to normal use. However, it is still recommended to have the watch repaired by a professional watch repair shop. They will be able to seal the front and back properly to assure no future leaks. Have them run a pressure test to ensure there are no potential leak areas.
Standard Upkeep Proper maintenance is imperative, especially on delicate mechanisms like timepieces. Even before your watch fills with moisture or stops working, it is a good idea to maintain it on a regular basis. The inside of a watch is filled with tiny gears and sensitive parts that must be installed perfectly to work properly. Under normal use and regular maintenance, a good watch will work for a lifetime.
It is important to minimize wear and tear when possible. Even though you may not see a crack in the seal, there very well may be one that could ruin your timepiece. Water, especially salt water, can be very damaging to a watch. Find a reputable repair shop to recommend a maintenance schedule for your timepiece.


Read more: http://www.doityourself.com/stry/how-to-repair-a-watch-with-water-damage#ixzz0x91faKz5 Step 1 - Minimize the Moisture If your watch is exposed to moisture or falls into water, the first thing you want to do is move it to a dry location. Dry off the water on the outside of the watch with a soft rag. The glass on the front can be easily scratched, so be sure to use a soft cloth to wipe clean.
Step 2 - Remove the Cover Open the cover on the back of the watch very carefully. Often a small flathead screwdriver will help in turning the cover. Pour any water out that remains. Be careful not to touch any of the gears or parts of the watch as the watch may become irreparable.
Step 3 - Air Dry Lay the watch face down in a warm room to allow it to air dry for at least 24 hours. After replacing the cover, the watch will often return to normal use. However, it is still recommended to have the watch repaired by a professional watch repair shop. They will be able to seal the front and back properly to assure no future leaks. Have them run a pressure test to ensure there are no potential leak areas.
Standard Upkeep Proper maintenance is imperative, especially on delicate mechanisms like timepieces. Even before your watch fills with moisture or stops working, it is a good idea to maintain it on a regular basis. The inside of a watch is filled with tiny gears and sensitive parts that must be installed perfectly to work properly. Under normal use and regular maintenance, a good watch will work for a lifetime.
It is important to minimize wear and tear when possible. Even though you may not see a crack in the seal, there very well may be one that could ruin your timepiece. Water, especially salt water, can be very damaging to a watch. Find a reputable repair shop to recommend a maintenance schedule for your timepiece.

Moisture can sometimes be removed by putting your watch in a warm place and leaving there for a day or so.

If it persists, then it may be necessary to remove the back of the watch. This is usually best left to a jeweler, especially if it is a waterproof type, as the seals can be difficult to re-fit. If your watch is still under warranty, then you may invalidate the warranty if you try any self repairs.

This usually happens when the watch is carried from low temperature to the room with higher temperature and it's called condensation. You need to dry out your watch and check if all the gaskets are in tact, flexible and lubricated. Don't leave it for a long, as later those tiny drops of condensate will sit down on gear wheels, causing them to rust and as a consequence will stop the watch working. Any watch repair shop will be able to help within a matter of an hour.
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To gain access to the face of a watch removing it from its case and is best left to a professional, since there can be unexpected difficulties.

Replacing the back seems to cause difficulties since care is needed to maintain the moisture seal.

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The film is moisture, you may have to remove the back and let if evaporate. You need new seals as it is your sweat that is causing it.