Frequently Asked Questions

Our purified water goes through a multi-stage Reverse Osmosis (RO) and Deionization (DI) filtration system that strips away 100% of minerals and hard water deposits, bringing Total Dissolved Solids (TDS) down to 0 ppm.

Standard tap water contains minerals like calcium and magnesium that leave white spots when dried. Pure water acts like a magnet for dirt, breaking it down naturally without chemical detergents. When pure water dries on your glass, it evaporates completely, leaving a spot-free, streak-free shine that stays cleaner up to 2x longer.

For most Long Island residential homes, we recommend exterior window cleaning 2 to 4 times per year (Spring, Summer, and Fall).

Homes near the North or South Shore beaches experience salt spray and humidity, which require quarterly cleaning. Properties surrounded by heavy trees or near busy roads also benefit from bi-monthly or seasonal cleaning.

Yes, absolutely! Every window cleaning service includes rinsing and wiping down the exterior window sills and frames. Our water-fed pole brushes gently scrub the frames to remove cobwebs, dirt, and insect droppings.

Screen washing and deep interior window cleaning can easily be added to any residential package upon request.

Clogged gutters are the #1 cause of preventable water damage on Long Island. When leaves, pine needles, and debris block your downspouts, rainwater overflows behind your fascia boards, leading to:

• • Roof leaks and wood rot
• • Foundation cracking and basement flooding
• • Mosquito and pest breeding grounds
• • Heavy ice dams during winter freezing weather

Routine gutter cleaning ensures proper roof drainage and protects your home's foundation.

We recommend cleaning gutters at least twice per year:

1. Late Spring: To remove oak tassels, seed pods, and pollen buildup.
2. Late Fall (November/December): After all autumn leaves have dropped to clear downspouts before winter snow and ice freeze in your gutters.

Yes, significantly. Dust, pollen, bird droppings, ocean salt, and chimney soot accumulate on photovoltaic glass and create a barrier blocking sunlight. Studies show dirty panels can lose 15% to 30% of their energy efficiency.

Regular pure-water cleaning keeps your solar investment producing maximum electricity output and reduces electric bills.

No, never. Solar panel manufacturers explicitly warn against using abrasive chemicals, pressure washers, or tap water (which leaves mineral etching).

We clean solar panels exclusively with 100% pure, chemical-free water and soft non-scratch nylon solar brushes. This safe approach adheres strictly to manufacturer warranty guidelines.

Rain water itself is pure water — it does not leave dirty spots! (Impurities in dirty windows cause spots when rain runs down).

However, if a heavy storm impacts your freshly cleaned windows within 48 hours of service, simply call us! We will come back and touch up affected glass free of charge. Your 100% satisfaction is guaranteed.

For exterior services, no! As long as we have access around the perimeter of your house and a working outdoor garden spigot, you do not need to take time off work or sit at home.

If we are providing interior window cleaning, someone over 18 must be present to let our uniformed team inside.

Yes! Pure H2O Window Cleaners carries full General Liability and Worker's Compensation insurance for total peace of mind on every residential and commercial property.

Getting a free estimate is fast and easy! You can call us directly at 516-260-3396 or fill out our online form on our Contact Page.