It looks good digimom,

I don't have a lot of experience with Vandas. Some orchids have a whitish layer or filmy look to them. For example the Brassavola digbyana (I couldn't find a good picture quickly).
This is natural. If it is a film build up you can take an old SOFT toothbrush and soapy water and gently clean the leaves. You may want to start on a lower leaf and try a small area to determine if the film is a build up or natural to the plant. A good friend is a commercial grower and the only water available to him at his nursery is well water. Often the leaves of his plants will turn orange due to minerals (etc.) in the well water. I always clean this off when I get them. You do need to take caution in extreme cases like these because a plant can get use to having the build up on the leaves which filters light. After you clean them they no longer have that filter and can be acceptable to burning.