Care & Maintenance

Care & Maintenance Below you will find the most frequently asked questions regarding care & maintenance for your Milgard windows and patio doors, along with an answer for each.
How do I eliminate the condensation that forms on my windows?

Interior Condensation
Interior condensation occurs because of high humidity and low air exchange inside the home. The high-performance energy efficient windows of today are designed to be air tight to reduce heat loss, which also reduces air flow and can cause condensation to form.

Three ways to fight interior condensation:

  1. Reduce moisture sources (humidifiers, plants, aquariums, etc.)
  2. Increase ventilation (open windows for a few minutes each day, especially during steam-producing activities such as showering, laundry and cooking)
  3. Leave closed interior shades up a couple inches above the window sill to allow for air movement between the shades and the window.

Exterior Condensation
Exterior condensation results from the same environmental conditions that cause dew to appear on grass. It forms when moist air comes into contact with cool surfaces, such as glass. Exterior condensation is actually a normal indication that the insulating glass in your windows is performing as it should, reducing heat loss and lowering utility costs. 

For more information, please view our Care and Maintenance Brochure

What do you recommend to clean the glass?

To ensure clarity and exceptional performance an occasional cleaning is necessary for all glass types. The best practice is to clean glass with a mixture of mild dish soap and water. When finished, rinse completely with clean water and wipe dry with a soft cloth.

NEVER use any of the following products on any part of your window or patio door as they may damage the glass surface or insulating seal.

Petroleum-based Cleaners
Abrasive/Acidic Chemicals
Razor Blades, Putty Knifes or Abrasive Pads
High-Pressure Water Hoses


What do you recommend for cleaning my vinyl frames?

You can wash your vinyl window and door frames with mild, nonabrasive soap and water.  First, remove any large particles (sand, bird droppings, etc.) with a soft bristle brush. Then, wash the surface using warm water, a mild soap, and a soft absorbent cloth. Wipe dry when finished. Periodic or seasonal cleaning using these steps will maintain your premium finish for years to come.

Recommended Cleaners for Vinyl Windows


Mild Soap and Water
Simple Green
Aqua Clean
Fantastik Orange Action
Hydro Force Glass Cleaner
Lysol All-purpose Cleaner
Murphy Oil Soap
Nu Vinyl 

* Always test cleaners in an inconspicuous area first.

Does my hardware need maintenance?

Milgard’s window and door hardware is protected by special coatings and lubricants. However, these coatings and lubricants can be damaged by common household products and harsh environmental conditions, such as coastal and industrial areas. These conditions can cause the windows and doors to become more difficult to operate and cause the hardware to wear or corrode faster.

Loss of functionality of hardware in highly corrosive environments, which includes any Home located within two miles of salt water and any Home located in the State of Hawaii, is excluded from Full Lifetime Warranty coverage.

In order to maintain the appearance and function of your hardware for years to come, we recommend that hardware be inspected once a year (more if necessary) and cleared of dirt and grime build up.

Please reference the FAQ questions: How do I clean my hardware? How do I lubricate my hardware?

How do I clean my hardware?

We recommend cleaning your hardware with mild soap and water using a soft damp cloth. When done, rinse with clean water, wipe dry with a soft cloth, and then allow the hardware to air dry completely before lubricating. 

Never use abrasive or acidic cleaners. These types of cleaners will remove the lubricants and corrosion resistant coatings from the hardware.

Vinegar Based Cleaners  
Citrus Based Cleaners (Lemon, etc.)  
Chlorine Based Cleaners  
Industrial Strength Cleaners  
Lacquer Thinner
Isopropyl Alcohol 
Goof Off
Silicone Sprays/Lubricants
Glass Cleaners with any of the above ingredients


How do I lubricate my hardware?

After the hardware is clean and dry it must be lubricated to restore the smooth operation and corrosion resistance. There are a number of commercially available products which can be used. Be careful not to apply excessive amounts of grease. Wipe up any drips or spills when applying grease since it will stain wood.

If you would like a recommendation on which lubricants are best for certain hardware parts, please call a Milgard Sales Representative at 1.800.MILGARD.

There was water on the inside of my window during a recent storm. Is this normal? How can I fix it?

Though this may be alarming at first, water on the inside of your window may be present during rainstorms. However, our windows and patio doors have a specially designed "weep" drainage system on the exterior bottom rails of the frames that allows water to drain to the outside while still protecting the inside of your home.

As water slowly drains it will build up on the sill or outside track. This is why it is important to annually inspect and clean the sill and track of dirt and debris to prevent clogging and assure proper drainage. A good time to clean weep holes is when excessive rain is anticipated. To clean, use a soft bottlebrush, pipe cleaner, or paper clip to gently clear the weep hole openings.

Can scratches on a window frame or door be repaired?

For paint finish scratches on vinyl or fiberglass please consult a painting professional. They can help with professional touch up’s or re-application of the finish.  

If you have scratches on an interior wood veneer (thin piece of wood) frame or door and would like the scratches removed you can submit a service request form or call 1.800.MILGARD. A Milgard certified technician would remove the scratched interior section of the frame and re-apply a new wood section.  This service is not covered by the Full Lifetime Warranty

Can scratched glass be repaired?

As a guideline, if the scratch is deep enough to catch the edge of a fingernail, it's too deep to remove. On the other hand, lighter scratches and scuffs can be removed with polishing compounds found at most home repair stores. To prevent future scratches be diligent about cleaning dirt and debris off the glass before it etches the surface.