Astro utilises its unique High Fidelity Alloy coating to give the sharpest, brightest images. This coating is designed and applied in a way that allows you to get the most out of your telescope.
Under normal circumstances the coatings will give excellent results for up to 10 years. Nearly all reflecting telescope sytems will require a recoat after this amount of time.
can I tell if my mirror requires a recoat?
A good indoor test that can be easily performed is to hold the mirror (be careful with large mirrors) up to a clear 60-100W light globe and look through it from behind. If you can see the filament of the globe through the coating then the mirror definitely needs a recoat.
Cleaning of mirrors should be done with extreme caution, otherwise removal of the coating can occur. If there is only a small amount of dust on the mirror then it is best left uncleaned. A little bit of dust will do less damage than a poorly executed clean. Remember, if in doubt just ask Astro.