I use this product a lot, and like it very much.
Also, just used it on side mirror ~1 hour ago. It can be applied by machine or by hand.
I apply by machine on general glass, and with a MF towel on side mirror.
Apply the product to a MF towel 'wrapped' over 1 or 2 fingers. Spread product and work with little to moderate pressure in fast and small circular movements, then move it freely working up-down, left-right. Work it on the corners of mirror like contouring it.
Work the product until it turns almost or entirely transparent. You'll feel when it's done.
Get a clean MF towel and wipe of residue (wipe off may be very easy).
Hope I've helped,
Kind Regards.