Nobody loves washed out, totally white skies in photography. Instead we prefer skies with dramatic colors. There are several ways to prevent washed out skies;

• First and the best; a classic; do not shoot towards the sun or sunlight. Directing your camera towards sun, makes the light measurement harder for your camera. Because in this condition contrast of scene increases, and cameras are not good at calculating the right settings in high-contrast scenes. Because of high contrast, if you set your aperture and shutter settings to get the right colors of sky, your subject on the ground will be so dark, on the other hand, if you set your camera to get the true colors of your subject on the ground, the sky will be washed out. So don’t shoot towards the sun or the sunlight. If you should;
• You can use, ND (Neutral Density) Filters. Neutral density filters reduces the amount of light that passes through your lens. There are several different types of ND filters; there are ND filters that reduces the amount of light equally all over the filter these are called solid Natural Density Filters and there are some that one edge of the filter is clear (only glass or plastic) and the other edge of the filter is neutral density and these are called Graduated Neutral Density Filters. Using graduated ND filters are better in this case, because neutral density part reduces the amount of light coming from sky and preventing it to be washed out, while clear part prevent the subject on the ground being too dark because this part is clear and has no ability to reduce the amount of light. You better see them yourselves;

• There is one more thing you can do; take two pictures from with different settings for sky and the ground. Settings for sky makes the ground too dark and settings for ground makes sky washed out. So take these two pictures, and put them in two different layers in photoshop. Remember one of them is with a washed out sky but the colors of ground is normal and the other one with too dark ground but the sky is not washed out. So place the one with dark ground (not washed out sky) as your bottom layer, and put the other one on it as a second layer, than remove the washed out sky using a soft eraser in photosop, till your sky with normal colors from the bottom layer appears.