Need to know (if you’re new to this): Some windows are easier to clean than others. If your house is of recent vintage, your windows probably tilt in for better access (one manufacturer is debuting a casement window that tilts). Tilt-in windows are typically energy-efficient, with no storm windows to worry about.

In older houses, windows may not work well - tough to open or so poorly maintained that repairs are needed before you can even begin to clean.

Find a buddy: Window-washing is one household chore that goes faster with a two-person team: one does inside, one does outside, then each points out streaks and missed spots. Clean water needed? Hand in the bucket to your partner instead of climbing down the ladder.

Prewash instructions: Vacuum away dust and dirt around and inside the window frames. Check for mold and mildew, spider webs and wasp nests, leaks and places that need touch-up painting. Check for broken glazing and cracks, and repair and replace if necessary. If windows operate on weights and chains or ropes, check that they work properly.

Stronger than dirt: Experts seem to push the squeegee over other tools; they’re probably correct. The trick is to be sure that the squeegee with the widest blade will fit your smallest window. You’ll also need a tool with a razor blade to remove paint blobs or spots of uncertain origin from the glass. Warm water with a little soap, changed frequently, will do the job on most windows.

If you use rags, have a good, clean supply - you don’t want to push dirt from one place to another. Keep paper towels handy to remove the little drips of water that collect at the bottom rail of the window sash, plus a clean sponge to sop up water in the frame.

Where to start? Do the interior surfaces first: They’re easier to get to and tend to be cleaner - and you don’t want to grubby-up your equipment right away, or wear yourself out.

Rub-a-dub: Use a clean rag to remove the dust, dirt and grease you can see on a window. Then start washing. Use glass cleaner on dirt that won’t budge with just water. For outside surfaces, use a garden hose to spray off the worst of the grime. The operable word here is ‘‘spray, and gently, without much pressure. Do not use a power washer.

If you use newspapers (another popular method), take a sheet and wipe the window top to bottom on the inside, left to right on the outside, so if there are streaks, you’ll know exactly where.

Don’t do this: Never squeegee a window in direct sunlight; you’ll leave streaks. Also, don’t clean on a hot, humid day or on a hot, dry day; the water will dry on the glass too quickly and leave streaks.

Be organized: This is especially important if aluminum storm windows are involved. Slide the glass and screens out of the tracks and put them to the side while the window is washed inside and out. Then wash and dry the storm-window glass and screens and reposition them. (If the screens, likely to be dusty and even pollen-caked, aren’t cleaned, the first strong breeze will blow the gunk back onto your nice clear windows.) Wear clean, dry latex gloves to keep the storm-window glass fingerprint-free.