Seven tools, about $90, one trip to a hardware store: a 12-inch squeegee, spare rubber, a matching scrubber, a bucket, a few drops of dish soap, a fresh-bladed scraper, and two microfiber towels. Everything past that is either a specialty item or something a salesperson wants you to buy.
A 12-inch brass or stainless squeegee with handle, $18 to $30. A pack of replacement rubber, $4 to $8 per strip. A T-bar scrubber with a microfiber sleeve in the same width, $15 to $25. A five-gallon bucket, which you already own. Dish soap, which you also already own, at three to five drops per gallon and no more. A 6-inch scraper with a fresh blade, $12 to $20. Two microfiber towels in the 300 to 400 gsm range, about $8 for the pair. Add a six-foot extension pole, $25 to $40, only if you have glass above a comfortable standing reach. That is roughly $90 without the pole, $125 with it, and the only recurring costs are rubber and blades. There is no eighth tool. Professionals carry more because they work eight hours a day on other people's houses, not because the job requires it.
Width first. A 12-inch channel covers standard double-hung sashes, sliders, and most bedroom glass. Add a 6-inch for divided lites and grid windows, where a wide blade cannot reach the muntin. An 18-inch is worth it only if you have several large picture windows. Skip the 24-inch and 36-inch entirely; those are storefront widths and they ride over the slight bow in residential glass, leaving a stripe of water down the middle. Rubber second, and this is the part people get wrong. The rubber is the only piece that touches the glass, and a fresh edge is good for roughly four to eight hours of actual pulling. Flip it once, then replace it. If you have to go back over a stroke, the rubber is worn, not your technique. Never store the squeegee resting on its edge in a bucket. A week like that puts a permanent dip in the rubber, and that dip draws a line down every window you clean after.
This is the only tool in the kit that can ruin a window in a single stroke, so it gets its own rules. One: never scrape dry glass. The blade has to float on soapy water. Dry scraping drags whatever grit is on the pane straight across the surface. Two: a fresh blade every session. A blade with one nick in it scores a line the full length of the pull, and you will not see the nick until the damage is done. Three: tempered glass deserves real caution. Some tempered panes carry fabricating debris, tiny glass particles fused to the surface during heat treatment, and a scraper can pick one up and cut an arc-shaped scratch that never comes out. Test a two-inch square in a low corner and inspect it in raking light before you commit to the pane. Push forward only and lift on the return, because dragging backward pulls debris under the edge.
Hose-end no-rinse spray kits are the worst value on the shelf. They finish by rinsing with tap water, and Treasure Valley groundwater commonly runs 10 to 13 grains per gallon, roughly 170 to 220 ppm of dissolved calcium and magnesium. Those minerals dry on the glass and you end up spottier than when you started. Magnetic two-sided cleaners are rated for one specific glass thickness and either lose grip on a double-pane or grind trapped grit into it. Robot window cleaners, $200 to $400, need a continuous smooth surface and stall on grids, divided lites, and any pane under about 20 inches. Newspaper is a myth that outlived its ink; it is a mediocre absorbent that sheds pulp. Paper towels lint. Ammonia cleaners attack tint film and dry out vinyl gaskets. And skip razor-blade holders wider than 6 inches, which flex in the middle and lift a corner into the glass.
Three to five drops of dish soap per gallon is the whole recipe. Too little and the rubber chatters; too much leaves a film that grabs dust within a week and makes the window look dirty faster than no cleaning at all. Use lukewarm water. Below about 40 degrees, squeegee rubber stiffens and skips, which is why a January exterior wash rarely goes well for a homeowner. The bigger enemy here is sun. On a south-facing pane above roughly 80 degrees, your solution flashes dry before you finish the pull, and the only fix is rewetting the whole window. Overcast mornings between 45 and 75 degrees are ideal. Time the season too: pressurized irrigation in the valley runs about April through mid-October, so exterior glass cleaned in May and hit by sprinkler overspray all summer is money spent twice. Turning the offending head is free and does more than any product.
Interior glass is genuinely a do-it-yourself job, and we would rather say that than sell against it. A typical Meridian or Boise house has 25 to 40 interior panes, and the kit above handles them in two to four hours. Do not pay a company to clean inside glass you can reach standing on the floor. Hire out the parts that are actually hard: second-story exteriors, hard water restoration, and screens. And do not buy a ladder to solve the upstairs problem, because ladder falls put well over a hundred thousand Americans in emergency rooms every year and a $30 squeegee is not worth that math. Finally, three conditions no tool fixes. Etched glass is corrosion inside the surface. A failed insulated seal is fog sealed between panes. A scratch is a scratch. If the haze looks identical wet and dry, put the squeegee down and price a glazier instead.
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A 12-inch channel is the right single purchase for most homes. It fits standard double-hung sashes and sliders without fighting the frame. Add a 6-inch if you have grid or divided-lite windows, and an 18-inch only if you have several large picture windows. Avoid 24-inch and wider. Those are built for flat storefront glass and they ride over the slight bow in residential panes, leaving water down the center of every pull.
Sooner than most people think. A fresh edge holds up for about four to eight hours of actual squeegee work, and the edge dulls from use, not from age on the shelf. Flip the strip once to get the second edge, then replace it. The signal is simple: if you are going back over a stroke to fix streaking, the rubber is finished. A replacement strip runs $4 to $8, which is the cheapest fix in the whole kit.
Dish soap is fine and it is what most professionals use for hand work. The ratio matters more than the brand: three to five drops per gallon of lukewarm water. The soap is there for glide, not for cleaning power. Overdosing is the common mistake, and it leaves a residue film that attracts dust and makes the glass look dirty again within a week. Commercial concentrates do not clean noticeably better at homeowner scale.
Both, in a specific split. A $25 squeegee with fresh rubber outperforms a $60 squeegee with worn rubber every time, so the consumable matters more than the brand. What technique changes is speed and edge detailing, which is where most homeowner streaking happens. Expect a real learning curve of five to ten windows before your results look consistent. After that, the tools are no longer the limiting factor.
For one house, the numbers do not work. Homeowner DI setups run $300 to $600, and at valley water hardness of roughly 170 to 220 ppm, a half cubic foot of mixed-bed resin exhausts after only a few hundred gallons, with refills at $50 to $90. Reflekt runs 100% pure deionized water with no soap because we process many houses a week and the resin cost spreads across all of them. For a single home, a squeegee and clean technique gets you the same clear glass.
Usually, if you follow three rules. Never scrape dry glass; the blade must float on soapy water. Use a new blade every session, because a single nick will score a line the length of the stroke. And treat tempered glass carefully, since some tempered panes carry fabricating debris that a blade can drag into an arc-shaped scratch. Test a two-inch square in a low corner and check it in raking light before working the full pane.
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