Anti Reflective coating and a old silk cloth with Windex residual and cleaning?

Anti-reflective coatings are really good but you do have to be careful with cleaning them or they smear. Also they dont' last for ever but it does help to look after them properly. Get a proper spray/wipe designed for anti-reflective coatings and a microfibre optical cloth. Silk tend to get static and anyway isn't very effective with things like grease. It doesn't scratch which is why its recommended. Microfibre has ALL the advantages ( I had glasses before microfibre came out). Glasses are expensive and it pays to look after them properly. I don't know if your environment will wear the coatings out more swiftly, they certainly do wear out but I find it takes about 5 years or so.