Quick Answer: Buy CLR Calcium, Lime & Rust Remover if you only want one bottle. Its label covers bathroom fixtures and appliances like drip coffee makers, dishwashers and washing machines, which Lime-A-Way's label rules out. Buy the Lime-A-Way spray if you mostly want a ready-to-use trigger for shower walls, glass and tubs, with no mixing. Neither belongs on marble, granite or other natural stone.
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| Job | CLR | Lime-A-Way spray | Our pick |
|---|---|---|---|
| Showerhead soak | Listed on label | Not specifically listed | CLR |
| Glass shower door | Glass is listed | Fine for hard-water stains | Either |
| Chrome faucet / stainless sink | Chrome and stainless are listed | Label warns against "metallic or painted surfaces" | CLR |
| Toilet bowl ring | Listed | Not specifically listed | CLR, or a bowl gel (see the alternatives section) |
| Drip coffee maker, dishwasher, washer | Listed, with dilution steps | Label says avoid | CLR |
| Fiberglass tub / shower | Listed | Not excluded; test older or worn finishes | Either |
| Marble, granite, travertine | No | No | Neither |
| Brass, copper, aluminum | No | No (aluminum, metallic) | Neither |
| Colored grout | Test first | Label says avoid | Neither without a test |
Winner: CLR, because it handles more jobs on its label. Lime-A-Way is the better buy only if bathroom surfaces are all you clean and you want spray-and-wipe convenience.
In this guide
Different acids, different rules
Both remove limescale the same basic way: acid dissolves calcium carbonate. The acid each one uses explains most of the differences in the table above.
CLR uses lactic acid and gluconic acid, both organic acids. CLR's formula is recognized under the EPA's Safer Choice program, and the maker describes it as septic safe when used as directed. The label has one firm rule: don't leave it on any surface for more than two minutes. Apply it, scrub, and rinse with cold water. For heavier crust, do it again rather than letting it sit longer.
Lime-A-Way's trigger spray lists sulfamic acid, an inorganic acid, along with a surfactant and fragrance. You spray it on, wipe with a damp cloth or sponge, and rinse well. The label is cautious. It says to avoid countertops, food-contact surfaces, cookware, coffee makers, kettles, humidifiers and washing machines, and to test older porcelain and ceramic tile because they may etch.
Bottom line: CLR gives you a longer list of places it's allowed and one strict time limit. Lime-A-Way gives you a shorter list and a convenient spray.
Job by job
Crusty showerhead
CLR wins this easily because a showerhead soak is listed on its label. Dilute it with equal parts warm water for general use, as the label directs. Keep the two-minute contact rule in mind: dip or wipe, scrub the nozzles, rinse. If it's still crusty, repeat. Don't leave a plastic bag of CLR on it overnight, a hack that shows up all over the internet. If the head is brass or has a decorative finish, skip CLR, because the label says it can strip brass. Our guide to a scale-clogged showerhead also covers the vinegar method for finishes you're unsure about.
Glass shower doors
Either works on fresh spotting. Lime-A-Way's trigger is more convenient on a vertical panel. CLR is better if the film is thick, because you can wipe on the diluted solution and repeat in short rounds. If spots don't come off with either, the glass may be etched rather than coated. Our guide to removing hard water stains from glass shower doors shows how to tell the difference.
Faucets and the white crust around the base
CLR lists chrome and stainless steel by name. Lime-A-Way's label warns against "metallic or painted surfaces." That's vague, but it's enough that we wouldn't use it on fixtures. For the crust where a faucet meets the counter, wrap the base in a CLR-dampened cloth for no more than two minutes, scrub with an old toothbrush, and rinse well. If your counter is stone, protect it first. More fixes are in our guide to white spots on faucets.
The toilet ring
CLR lists toilet bowls on its label. Lime-A-Way's spray doesn't, so for regular ring duty a dedicated bowl gel, linked in the alternatives section below, is the simpler tool. For a ring at the waterline, first lower the water level so the cleaner reaches the stain at full strength. Our guide to the hard water ring in the toilet covers the pumice-stone step for old rings.
Coffee maker, dishwasher, washing machine
This is where the choice is clearest. CLR gives specific directions:
- Drip coffee maker (10–12 cup): 1 part CLR to 8 parts water. Run one full cycle, discard it, then run two full cycles of clean cold water. Use it in drip machines only, not espresso machines or units that keep water in a reservoir.
- Dishwasher: remove any rinse agent first, put ½ cup in the empty bottom, run a normal cycle, then an extra rinse.
- Washer: ½ cup in an empty top-loader during the wash cycle, or ¼ cup for HE machines, followed by a water-only cycle.
Lime-A-Way's label says not to use it in coffee makers, kettles or washing machines. If descaling appliances is part of why you're buying, the decision is made. For kettles and steam irons, see our guide on limescale in kettles, coffee makers and irons. CLR's label specifically excludes steam irons, steamers and ice makers.
Which bottle goes further
This affects value more than the price tag does. CLR is sold as a concentrate. For general cleaning, the label says to mix it with equal parts warm water. For a coffee maker it's 1 part CLR to 8 parts water, and an appliance clean uses a measured ¼ to ½ cup. A 42 oz jug therefore makes far more working solution than 42 oz.
Lime-A-Way's trigger is ready to use. You spray it straight from the bottle. That's handy on a shower wall at 7 a.m., but every pull of the trigger is full-strength product, so a 22 oz bottle goes faster on big glass panels.
If you clean a lot of surface area, such as a large walk-in shower or several bathrooms, CLR mixed into your own spray bottle is the more economical setup. Label the bottle clearly, and never reuse one that held a bleach cleaner.
Fumes, gloves and kids
Both are acids, and both labels ask for basic care:
- Ventilation. CLR's label says to use it in a well-ventilated area. In a small bathroom with no fan, open a window or the door.
- Gloves. Lime-A-Way's directions start with "wear rubber gloves." Do the same with CLR. Repeated contact dries out and irritates skin.
- Storage. CLR says to use or dispose of a bottle within three years and to keep the cap fastened. Store both bottles up high, away from bleach-based products.
Where neither one goes
Put both away for these:
- Natural stone: marble, granite, travertine, terrazzo. Any acid can etch it. Use a stone-safe cleaner instead.
- Brass, copper and aluminum: CLR's label says it can strip the finish and pit some grades.
- Water heaters: CLR's maker specifically doesn't recommend it for tank or tankless heaters.
- Anything mixed with bleach. Both labels warn against mixing with other household chemicals. Acid and bleach together release chlorine gas.
Before you spray anything: a 30-second test
Older tubs, worn enamel and some tile glazes react to acid even when the label allows it. Both makers recommend a spot test. Pick a hidden corner, apply the product the way you plan to use it, wait no more than CLR's two minutes, rinse and dry. If the spot looks dull, chalky or rough compared with the area around it, stop.
Two bottles that cover the gaps
Bar Keepers Friend Soft Cleanser Liquid. This is a micro-abrasive scrubbing liquid with oxalic acid. It's useful when the problem is water spots plus grime on a stainless sink or cookware, where you'd rather not use a straight acid soak. It's slower than CLR on thick scale, but easier to control on surfaces you'll be scrubbing anyway. Unlike CLR, its label also lists copper, brass and aluminum. This listing is two 26 oz bottles. Check price on Amazon
Lysol Toilet Bowl Cleaner, Lime & Rust. If toilet rings are your main problem, a cleaner made for toilet bowls is less fiddly than measuring out CLR every time. This one is a clinging gel with an angled neck that gets under the rim, it targets lime, rust and hard-water rings, and Lysol says it's septic safe when used as directed. This listing is a two-pack. Check price on Amazon
If you're cleaning scale off everything every week, these bottles only treat the symptom. At that point it's worth testing your water hardness and looking at what's causing the scale.