Q. We have two doors that, when opened, will not stay open. They close about halfway. New hinges did not solve the problem. Do you have any suggestions?

A. This is caused by the door not being hung perpendicularly. To correct the condition, one of the hinge plates on the frame, depending on which one is out of line, must be adjusted.

A thin shim of wood placed under the hinge plate will move it out from the door frame. A more difficult adjustment is made by deepening the recess to move the plate in the other direction.

Q. Several years ago I put safety nonskid strips in the tub and shower. I am planning to sell my home and I would like to remove them without leaving marks. How should I do this? The tub and shower are fiberglass.

A. The removal of this type of product will depend on the type of adhesive the manufacturer used. Here are several suggestions that have worked for other readers:

Spray the adhesive strips with Spray and Wash, let soak until the adhesive is softened, then remove. If you need to scrape any of the strips or residue glue, be sure to use a plastic scraper that will not scratch the fiberglass.

Another one of our readers recommended peanut butter. Evidently peanut butter, left overnight, is effective in softening some of these adhesives. Some more conventional methods use lemon oil, rubber cement solvent or lacquer thinner as solvents to dissolve the glue.

The key is the composition of the glue. Different glues require different solvents. Three other solvents you can try include methyl ethyl ketone, 34X and naphtha.

To soften the glue, so you can remove the rubberized strips or decals, try using a hair dryer. After the strips are removed you will only have to worry about the sticky glue residue.

Q. Please tell me what I can use to clean a set of aluminum pans. I was using Sunbeam Metal Klean, but I am unable to find it. Can you suggest something else? I like my pans to be bright.

A. There are numerous metal cleaners on the market. Check with a well-stocked hardware store or housewares outlet for one particularly recommended for aluminum.

A home remedy for cleaning aluminum pots and pans (particularly effective in cleaning inside discoloration) is to use cream of tartar (the scientific name is potassium bitartrate).

Fill a pot with water, dissolve a small box of cream of tartar in the water and bring to a boil. Let your aluminum utensils simmer until the dark discoloration and stains disappear, and the natural color is restored.

This is a solution that can be used on cast aluminum and other aluminum pots and pans. However, do not use on other materials.

Q. The Formica counter top in my kitchen is old and shows both scratches and cut marks and is discolored. Can Formica be painted? If so, what type of paint should I use?

A. Painting is not a good solution for older Formica tops. Even using one of the new two-part epoxy paints will not be satisfactory.

The new layer can be placed directly over the existing layer, and is a relatively easy job for an efficient handyman or carpenter. It is also possible to do it yourself if you are handy with carpentry tools and construction.

I suggest you use Color Core, or something similar that has color penetrating the entire product. This type of product will not show the scratches nearly as much as the regular plastic laminate, which has only a thin surface coating of color.

Penetrating coloring is more expensive, but worth the investment. If you are doing side paneling in addition to the counter tops, it is often possible to match the penetrating color product for use on counter tops only with a cheaper surface product for side paneling.

Reader tip: "I've just made the scientific discovery of the century -- how to clean water-stained crystal vases.

"Use liquid toilet bowl cleaner. I like Lysol Cling. It doesn't work on very old, very heavy stains, but it did wonders for a vase about three years old that was cloudy inside. I had tried vinegar and dishwasher detergent.

"I used a squirt {about one tablespoon} of cleaner, filled the vase with warm water {one cup}, and left it overnight. It cleaned perfectly."

Send inquiries to Here's How, Copley News Service, P.O. Box 190, San Diego, Calif. 92112-0190. Only questions of general interest can be answered in the column.