Review on Efficient Full Crystal Refill Kit: Two 4 Oz. Crystal Powder Packets for Sparkling Window Cleaning (Cleans up to 40 Windows) by Nicholas Kanat

This product states that this product is sufficient for 4000 m². Feet - in a box two packs of a crystal - 2000 square feet each pack. Mixed per printed instructions - applied per printed instructions - covered only 400sq ft. This is only half the problem, the instructions say mix it with water for worms and sew it up until dissolved. Wet the area to be cleaned, then apply the solution from the bottom up, which is what we did, then wait 30 seconds (don't let it dry) and then wash off the dirt. I did - but the dirt didn't come off - just one solution. The area to be cleaned was just as dirty as the first time, only now it was wet. This product doesn't work - not recommended except for this stuff. I ended up using a pressure washer with a cleaning solution that got the job done. Would love to return this stuff but unfortunately missed the return date so it goes in the trash - wasted money,