Who hasn't experienced this kind of frustration? You spend two hours cleaning all the windows in the house: diluted dish soap, scraping away water stains with a squeegee, wiping with newspaper, only to look up and find watermarks everywhere, making the windows look even dirtier than before!

The rag gets smudged more with each wipe, lint sticking to the glass; the newspaper leaves your hands and the glass covered in black ink. Dust and debris in the window tracks—you use a toothbrush and vacuum, spending half an hour, but there's still residue, which the wind blows back onto the glass.

It rains right after you finish cleaning, leaving behind children's handprints and three days' worth of accumulated dust—all this "useless work" is utterly devastating. Afterwards, your arms ache, your back aches, and you collapse on the sofa, wanting to say: I'm never cleaning windows by hand again!

"Bird droppings, rain stains, tree sap, dried beverage stains... these stubborn stains on the glass can really drive you crazy! Bird droppings outside the window are hard and hard after drying. You're afraid of scratching the glass with your fingernails, and you have to rub it repeatedly with a damp cloth more than 10 times, leaving your arm sore and marks; rain stains on high-rise buildings mix with dust and clump together. If you scrape them hard with a glass scraper, the Low-E coated glass will be directly scratched, and the heat insulation effect will get worse and worse; I once used a steel wool pad to remove tree sap in a moment of madness (I later learned that it would scratch!), and after a whole afternoon of struggling, the glass was not clean, but instead had several more scratches. I still feel sorry for it to this day - manual cleaning not only cannot remove stubborn stains, but may also ruin your own glass!"