Diecast models are very easy to care for. A lightly dampened cloth will easily clean any surface dust and will not chance damaging the paint job. For models that have a good deal of decals on them it is better to just wipe them with a lint free cloth. Water may loosen the decals which can then be difficult to properly reattach.
If there are openings in the model itself then you can use canned air. Use short bursts while making sure to hold the can about six inches from the model. If you hold it too close you can damage the model. Sometimes the propellant can be shot from the cans and can cause frost damage to the decals or paint if you happen to turn the can upside down.
Always make sure to hold the can upright. If you are looking for a great way to display your diecast models then an oak or cherry bookcase can make a great display case. It is rather easy to add lights to the cases by drilling holes for the bulbs and using the small decorative bulbs that are typically used for Christmas trees. As long as these are placed in the holes using an adapter that can easily be found at a lighting store you will not run the risk of starting a fire.
You can also add glass to the front of the book case to keep wandering hands from handling your models and damaging them with the oils from their hands. Your hands contain a good deal of natural oils and it is very easy for these oils to be left behind on any surface that you touch. Diecast models are no exception.
Unpainted, these models can tarnish from the oils that come from your hands. Painted models can experience damage to the paint job from the oils over time. The oils can even damage the decals that may be present. By properly taking care of your diecast model tanks you can have a great looking collection that will last a very long time.
–Victor Epand
-DiecastTank.com