Some marks will not come off with a washer. Fly spots baked onto a shop front, sap down a conservatory, the grey film along the bottom of a frame. You can reach for a blade, but then you are detailing every pane afterwards and working around anything a blade should not touch. The Jitterbug sits in between. It is a flat hand scrubber that holds a walnut pad, made from real crushed walnut shell. Walnut is hard enough to cut through grime and softer than the glass, so it lifts the muck without the scratch risk of a metal pad. The pad holds on with hook and loop, so it peels off to rinse and goes back on square. The body is 3D printed in PETG rather than injection moulded. You will see the print lines, which is worth knowing before it turns up, but PETG is a tough plastic that copes with the soaps and solvents living in a van. The handle is a long wave you grip with the whole hand for pressure on the glass, and it hooks over a belt or a pocket when you are not on it. Walnut pad included: real crushed walnut shell, cuts grime without the scratch risk of a metal pad. Spares are the 6 inch Maykker Walnut Pad, sold in packs of five. Hook and loop: the pad peels off to rinse and goes straight back on. Doubles as a hand mop: takes a 6 inch mop washer such as the Maykker Scotsman Mop Washer if you want to wet and wash with it. Wave handle: full hand grip for pressure, and it hooks over a belt or pocket between panes. 190g: light enough to live in the bag rather than the van. Worth knowing: the walnut pad is not recommended for tinted or filmed glass, low-E coated glass, or bulletproof glass. On any of those, test somewhere out of sight first or use a soft washer instead. That is a limit of the pad rather than the tool, and the same goes for any abrasive. It earns its place if you do a lot of low work: shop fronts, ground floor commercial, conservatories and frames. It is a hand tool, so it is no use at height.