This little robot window-cleaner is the best labor-saving device I've ever used, and it's going cheap at Amazon right now

Hate cleaning windows? Me too, which is why Winbot cleaning robots are some of my all-time favorite smart home gadgets. These bots use strong suction to grip your windows, and roll across the surface on soft rubber treads. They spray a fine must of cleaning solution onto the glass in a fine mist, then buff away dirt using a microfiber cloth. They're very effective, capable of removing even stubborn grime, and better yet, they're going cheap in Amazon's Labor Day sale.

I've used two Winbot robot window cleaners, each of which suits a different type of home. The Ecovacs Winbot Mini 2 is now $189 at Amazon (was $239.99), and is ideal for apartments. Its compact design means it has a much smaller turning circle than most robot window cleaners, and it fits easily onto narrow panels.

The Ecovacs Winbot W2 Pro Omni, which is now $399 (was $499.99), is great choice for larger homes. It comes with a rechargeable power pack that you can carry around indoors and out, so the robot itself doesn't have to be plugged in while it works.

I was surprised to find there's also a $100 discount on the Ecovacs Winbot WS2 Pro Omni, which is now $499.99 (was $599.99). This model launched at the IFA tech show in Berlin this week, and has three spray nozzles per side rather than the usual two for more even coverage when pre-treating the window, and fewer passes with the microfiber cloth afterwards for faster cleaning.

Today's best Winbot deals

Shop more of today's best Labor Day sales

• Amazon: 45% off TVs, AirPods, air fryers & vacuums
• Apple: iPads, AirPods & MacBooks from $99
• Appliances: up to $1,200 at Samsung
• Best Buy: 60% off appliances, TVs, laptops & more
• Casper: up to 30% off mattresses
• Dell: laptop deals from $249.99
• DreamCloud: up to 60% off mattresses, 66% off bundles
• Home Depot: 40% off appliances, furniture, grills & tools
• Lowe's: $1,000 off appliances, patio & tools
• Nectar: up to 50% off mattresses, deals from $349
• Saatva: up to $625 off luxury mattresses
• Samsung: up to $2,000 off 4K, QLED & OLED TVs
• Target: 45% off clothing, tech & furniture
• Walmart: 58% off back-to-school, furniture, & clothing