For many years, I have cleaned my glasses with soap and water.  But the other day, I decided that it was time to purchase some bottled cleaner for my glasses.  So when I got home from the store, I got out my cleaner and the special cleaning rag and began to clean my glasses.  When I finished, I held them up to the light to check them and discovered that they were still dirty.  So, I went through the process again.  And again, the results were the same.  After several tries, I gave up and used my good old soap and water and it worked just fine.  So much for the store bought stuff.