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Over the years I've received thousands of money-saving tips from readers -- many of which I've shared in books, newsletters and this column. And there are plenty that I've not shared for a variety of reasons, but mostly because they don't work. Some work so poorly, they end up costing time and money and not saving a thing! Today's first question reminded me of that useless tip. It still makes me laugh. It goes like this:

Start with two empty toilet paper tubes and a new roll of two-ply toilet tissue. Carefully separate the two layers of toilet tissue, rerolling each of the layers onto an empty tube to create -- ta-da! -- two rolls of paper for the price of one.

Not only does this take an unbelievable amount of time (unless you own a toilet tissue-rolling machine of some kind), but the result is a ginormous, ridiculous mess of toilet tissue that is so thin, it takes at least twice as much to get the job done.

Don't do that, OK? Instead, learn how to comparison-shop for toilet tissue. And when you find it on sale, stock up.

Dear Cheapskate: Is there a reliable way to compare prices on toilet tissue? It should be easy, but so far I haven't figured out how to do it. There has to be a way, and I'm going to bet you know it. Thanks! -- Darryl

Dear Darryl: Comparing prices on toilet paper is confusing. We can't compare roll for roll because roll sizes vary from one manufacturer to another. Some companies offer double rolls, jumbo rolls or even 1,000-sheet rolls -- all of which is pretty meaningless when trying to make a reasonable price comparison. Same with comparing the number of sheets per roll. There is no set size for a sheet of toilet paper! To make things even more confusing, some rolls are two-ply, others single-ply.

Price per square foot for thick (two-ply) or thin (single-ply) is the most reliable method for comparing toilet paper prices. Most manufacturers these days reveal both of these measurements on the product label. You may have to search for it, but somewhere you should be able to find this information. And you thought all those math classes you took in school were for naught? Finally, they're about to pay off. The goal is to discover the price per square foot of the products you are comparing. Do this by dividing the price of the product by the number of square feet.

If the product label reveals the number of square feet (often expressed as "FT2") contained therein, you're in luck. If the label shows how many square inches of product are contained in the package, divide that number by 144 to get to the number of square feet. Now divide that result into the price.

If the store's shelf label reveals the price per 100 square feet, divide that price by 100 to get the price of one square foot.

Dear Cheapskate: Please advise how to remove rust spots from white cutwork linen pieces or from any kind of fabric, for that matter. I have no idea where these spots came from but would love to remove them. Thanks. -- Frieda

Dear Frieda: Provided these items are washable, soak the rust spot with lemon juice, then work table salt into the spot. Set it out in the sun for a few hours. Brush the salt away. If any rust stain remains, repeat. Once the rust stain is gone, launder as usual.

Dear Cheapskate: I can't keep lettuce in my refrigerator for more than two days without it turning rusty. I've tried everything: Tupperware containers, washing and putting paper towels in the bag with it, not washing until using. Even though the date on the package is good for at least five days after opening, I end up throwing it away before that time. I can't be the only one with this problem. -- Pat

Dear Pat: "Rust" on lettuce leaves is harmless. It develops from the natural breakdown process in the cells once the lettuce is harvested. Just know that it isn't rust as we think of it. This color change indicates old lettuce. But don't worry. As long as these are only spots, that lettuce is still perfectly fine -- no need to toss it out just yet. Sure, it might not look its best, but it's totally fixable. Do this: Grab a sharp chef's knife and trim off those rusty edges. Just hold the lettuce steady, slice away from yourself (because, you know, safety first), and you'll have fresh lettuce ready to go in no time.

In the future, when selecting head lettuce, look at the "stem" area where the head was cut from the stalk. If it is bright white, you know that head is very fresh. If it is rust-colored, it's getting old. Select the head that's closest to white for your freshest choice.

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Mary invites you to visit her at EverydayCheapskate.com, where this column is archived complete with links and resources for all recommended products and services. Mary invites questions and comments at https://www.everydaycheapskate.com/contact/, "Ask Mary." This column will answer questions of general interest, but letters cannot be answered individually. Mary Hunt is the founder of EverydayCheapskate.com, a frugal living blog, and the author of the book "Debt-Proof Living."

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