I'm an electronics engineer and I've been working in robotics for ten years. I'll get to the point. Buy this. It's not perfect, but at $199 it's a good value. What amazed me was the ability to remove dirt from an exterior window for two years using DRY cleaning wipes. Check out my video. He can't reach every corner, but that's enough. Removes foil well inside. I make my own liquid to easily spray onto the pads. I use Dollar Tree's Universal Windex and mix in about 15% of their 50% alcohol for a rub. Works perfectly. I am very happy with my purchase. Hope this lasts long. PS You can get the same item on eBay for around $130 but I decided to buy from Revain first knowing I could return it if I wasn't happy with it. Buying directly from China is often risky and a hassle if you are not happy with your purchase.
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