AhHa Bill! I remember AND use them for windows, mirrors, tile, all types glass anywhere!

Now, do you remember - the KOZAK Auto DryWash cloths? They are still available and do a great job.
They have a camel logo and are a soft, brushed fabric with something impregnated into the cloth. You use it folded - NEVER scrunched up - change the fold as it gets dirty. Shake out. Re-use again and again and again.
After using the KOZAK most all car dirt is gone, then you just hose the car off - or wait for the next rain - and the car is all shiny new again!

No I do not own stock in the company ... I remember my Grandfather using the cloth so its been around awhile and doesn't need me to plump for it!