this product is always so easy to use ..I was worried that it would not work, hesitant to say the least but the very first time to the very last time I use it , it has to be by far one of the best, easiest products I will ever use and as for cost efficient it is well within range as you dont use this product once but several times. In your wildest dreams imagine if you will picking up a sponge and wiping off any type of debris and scuff marks. well hey this is it right here in a nutshell.