The simple answer is, most cleaners are designed to be sprayed directly on the surface.
However, it really it depends on the surface, if you’re getting a small area, the spraying the cleaning implement then wiping can be preferred to save cleaner, however if you’re doing a wide area, spraying directly on the surface is more efficient and effective.
Let’s say a horse died in your living room, should you spray soap on it and scrub it? When I was a carpet cleaner my boss used this analogy to teach us to vacuum and “remove the horse” from the carpet before introducing any new elements. once a majority of the dirt’s out then we could get to work on stains.
Former professional window cleaner here: best way to clean a window is with dish soap (regular stuff not fancy stuff with smells and vitamins) and water, and a squeegee.
If you use something like Windex it’s better to apply it to paper towel rather than on the window directly so you’re not breathing in the aerosols.
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